Quarterly report pursuant to Section 13 or 15(d)

Equity and Long-Term Incentive Compensation Plans - Compensation Expense (Details)

v2.4.1.9
Equity and Long-Term Incentive Compensation Plans - Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
Stock-based compensation expense          
Stock-based compensation expense $ 12,767us-gaap_AllocatedShareBasedCompensationExpense $ 12,723us-gaap_AllocatedShareBasedCompensationExpense $ 43,098us-gaap_AllocatedShareBasedCompensationExpense $ 46,812us-gaap_AllocatedShareBasedCompensationExpense  
Stock-based compensation capitalized as inventory 3,294klac_StockBasedCompensationCapitalizedAsInventory   3,294klac_StockBasedCompensationCapitalizedAsInventory   8,278klac_StockBasedCompensationCapitalizedAsInventory
Costs of revenues          
Stock-based compensation expense          
Stock-based compensation expense 1,642us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember 		1,688us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember 		5,842us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember 		7,186us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember 		 
Engineering, research and development          
Stock-based compensation expense          
Stock-based compensation expense 2,941us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		3,512us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		10,016us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		12,797us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		 
Selling, general and administrative          
Stock-based compensation expense          
Stock-based compensation expense $ 8,184us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember 		$ 7,523us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember 		$ 27,240us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember 		$ 26,829us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember