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COMMON STOCK REPURCHASES (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]    
Remaining shares authorized for repurchase under program 336,210us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased  
Shares repurchased 596,290us-gaap_TreasuryStockSharesAcquired 1,281,907us-gaap_TreasuryStockSharesAcquired
Total cost of shares repurchased $ 27,443us-gaap_PaymentsForRepurchaseOfCommonStock $ 56,754us-gaap_PaymentsForRepurchaseOfCommonStock
Average cost per share of shares repurchased $ 46.02us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 44.27us-gaap_TreasuryStockAcquiredAverageCostPerShare
Value of shares withheld in satisfaction of employee tax withholding obligations $ 7,306plt_EmployeesTaxesWithheldAndPaidForRestrictedStockAndRestrictedStockUnits $ 6,014plt_EmployeesTaxesWithheldAndPaidForRestrictedStockAndRestrictedStockUnits