Quarterly report pursuant to Section 13 or 15(d)

Stock Repurchase Program (Details)

v2.4.1.9
Stock Repurchase Program (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended
Oct. 23, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Jul. 08, 2014
Equity, Class of Treasury Stock [Line Items]            
Increase in authorized shares to be repurchased           13,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Number of additional shares authorized to be repurchased 3,600,000klac_StockRepurchaseProgramNumberofAdditionalSharesAuthorized          
Authorized shares to be repurchased   12,100,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased   12,100,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased    
Number of shares of common stock repurchased   2,644,000us-gaap_TreasuryStockSharesAcquired 930,000us-gaap_TreasuryStockSharesAcquired 6,506,000us-gaap_TreasuryStockSharesAcquired 2,927,000us-gaap_TreasuryStockSharesAcquired  
Total cost of repurchases   $ 168,943us-gaap_TreasuryStockValueAcquiredCostMethod $ 59,880us-gaap_TreasuryStockValueAcquiredCostMethod $ 447,892us-gaap_TreasuryStockValueAcquiredCostMethod $ 180,686us-gaap_TreasuryStockValueAcquiredCostMethod  
Other Current Liabilities            
Equity, Class of Treasury Stock [Line Items]            
Number of shares of common stock repurchased       218,600us-gaap_TreasuryStockSharesAcquired
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Total cost of repurchases       $ 12,900us-gaap_TreasuryStockValueAcquiredCostMethod
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