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 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Stock-based compensation expense          
Stock-based compensation expense $ 14,848us-gaap_AllocatedShareBasedCompensationExpense $ 14,870us-gaap_AllocatedShareBasedCompensationExpense $ 30,331us-gaap_AllocatedShareBasedCompensationExpense $ 34,089us-gaap_AllocatedShareBasedCompensationExpense  
Stock-based compensation capitalized as inventory 3,389klac_StockBasedCompensationCapitalizedAsInventory   3,389klac_StockBasedCompensationCapitalizedAsInventory   8,278klac_StockBasedCompensationCapitalizedAsInventory
Costs of revenues          
Stock-based compensation expense          
Stock-based compensation expense 1,963us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember 		2,321us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember 		4,200us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember 		5,498us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember 		 
Engineering, research and development          
Stock-based compensation expense          
Stock-based compensation expense 3,335us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		3,877us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		7,075us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		9,285us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		 
Selling, general and administrative          
Stock-based compensation expense          
Stock-based compensation expense $ 9,550us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember 		$ 8,672us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember 		$ 19,056us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember 		$ 19,306us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember