Quarterly report pursuant to Section 13 or 15(d)

Equity and Long-Term Incentive Compensation Plans - Cash Dividends (Details)

v2.4.1.9
Equity and Long-Term Incentive Compensation Plans - Cash Dividends (Details) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Feb. 05, 2015
Nov. 19, 2014
Nov. 30, 2014
Dec. 31, 2014
Jun. 30, 2014
Dividends Payable [Line Items]                  
Cash dividends declared per share (including a special cash dividend of $16.50 per share declared during the three months ended December 31, 2014) $ 0.5us-gaap_CommonStockDividendsPerShareDeclared $ 0.45us-gaap_CommonStockDividendsPerShareDeclared $ 18us-gaap_CommonStockDividendsPerShareDeclared $ 1.35us-gaap_CommonStockDividendsPerShareDeclared          
Payment of dividends     $ 2,961,402,000us-gaap_PaymentsOfDividends $ 224,405,000us-gaap_PaymentsOfDividends          
Retained earnings (accumulated deficit) (2,582,000)us-gaap_RetainedEarningsAccumulatedDeficit   (2,582,000)us-gaap_RetainedEarningsAccumulatedDeficit           2,479,113,000us-gaap_RetainedEarningsAccumulatedDeficit
Dividends payable - financing activities 41,412,000us-gaap_DividendsPayableCurrentAndNoncurrent 0us-gaap_DividendsPayableCurrentAndNoncurrent 41,412,000us-gaap_DividendsPayableCurrentAndNoncurrent 0us-gaap_DividendsPayableCurrentAndNoncurrent          
Restricted Stock Unit, Performance-Based And Service-Based                  
Dividends Payable [Line Items]                  
Dividends payable - financing activities 41,400,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= klac_RestrictedStockUnitPerformanceBasedAndServiceBasedMember
  41,400,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= klac_RestrictedStockUnitPerformanceBasedAndServiceBasedMember
           
Regular Cash Dividend                  
Dividends Payable [Line Items]                  
Cash dividends declared per share (including a special cash dividend of $16.50 per share declared during the three months ended December 31, 2014)         $ 0.50us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= klac_RegularCashDividendMember
       
Payment of dividends     245,500,000us-gaap_PaymentsOfDividends
/ us-gaap_DividendsAxis
= klac_RegularCashDividendMember
           
Regular Cash Dividend | Restricted Stock Unit, Performance-Based And Service-Based                  
Dividends Payable [Line Items]                  
Dividends payable - financing activities 600,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= klac_RestrictedStockUnitPerformanceBasedAndServiceBasedMember
/ us-gaap_DividendsAxis
= klac_RegularCashDividendMember
  600,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= klac_RestrictedStockUnitPerformanceBasedAndServiceBasedMember
/ us-gaap_DividendsAxis
= klac_RegularCashDividendMember
           
Regular Cash Dividend | Retained Earnings                  
Dividends Payable [Line Items]                  
Payment of dividends   74,800,000us-gaap_PaymentsOfDividends
/ us-gaap_DividendsAxis
= klac_RegularCashDividendMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  224,400,000us-gaap_PaymentsOfDividends
/ us-gaap_DividendsAxis
= klac_RegularCashDividendMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Regular Cash Dividend | Additional Paid-in Capital                  
Dividends Payable [Line Items]                  
Payment of dividends 80,800,000us-gaap_PaymentsOfDividends
/ us-gaap_DividendsAxis
= klac_RegularCashDividendMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
               
Special Cash Dividend                  
Dividends Payable [Line Items]                  
Cash dividends declared per share (including a special cash dividend of $16.50 per share declared during the three months ended December 31, 2014)           $ 16.50us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
$ 16.50us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
$ 16.50us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
 
Total amount of dividends accrued               2,760,000,000us-gaap_DividendsCommonStockCash
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
 
Retained earnings (accumulated deficit)           0us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
     
Special Cash Dividend | Restricted Stock Units                  
Dividends Payable [Line Items]                  
Dividends payable - financing activities 40,800,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
  40,800,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
           
Special Cash Dividend | Retained Earnings                  
Dividends Payable [Line Items]                  
Total amount of dividends accrued           2,100,000,000us-gaap_DividendsCommonStockCash
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
     
Special Cash Dividend | Additional Paid-in Capital                  
Dividends Payable [Line Items]                  
Total amount of dividends accrued           $ 646,500,000us-gaap_DividendsCommonStockCash
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember