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INCOME TAXES (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Current:        
Federal   $ 26,938,000us-gaap_CurrentFederalTaxExpenseBenefit $ 28,859,000us-gaap_CurrentFederalTaxExpenseBenefit $ 25,530,000us-gaap_CurrentFederalTaxExpenseBenefit
State   2,685,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,263,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,452,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign   4,253,000us-gaap_CurrentForeignTaxExpenseBenefit 4,384,000us-gaap_CurrentForeignTaxExpenseBenefit 4,777,000us-gaap_CurrentForeignTaxExpenseBenefit
Total current provision for income taxes   33,876,000us-gaap_CurrentIncomeTaxExpenseBenefit 34,506,000us-gaap_CurrentIncomeTaxExpenseBenefit 32,759,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:        
Federal   (1,148,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (4,675,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (586,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State   (1,353,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (629,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (474,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign   1,575,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit (480,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 324,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred benefit for income taxes   (926,000)plt_DeferredIncomeTaxesExpenseBenefit (5,784,000)plt_DeferredIncomeTaxesExpenseBenefit (736,000)plt_DeferredIncomeTaxesExpenseBenefit
Income tax expense 1,800,000us-gaap_IncomeTaxExpenseBenefit 32,950,000us-gaap_IncomeTaxExpenseBenefit 28,722,000us-gaap_IncomeTaxExpenseBenefit 32,023,000us-gaap_IncomeTaxExpenseBenefit
Components of income before income taxes        
United States   83,583,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 85,231,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 80,875,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign   61,668,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 55,908,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 57,550,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes   145,251,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 141,139,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 138,425,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Reconciliation between statutory federal income taxes and income tax expense        
Tax expense at statutory rate   50,838,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 49,399,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 48,449,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Foreign operations taxed at different rates   (15,839,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (16,175,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (15,244,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
State taxes, net of federal benefit   1,331,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 634,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1,978,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Research and development credit   (2,460,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch (1,805,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch (3,380,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Other, net   (920,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (3,331,000)us-gaap_IncomeTaxReconciliationOtherAdjustments 220,000us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense 1,800,000us-gaap_IncomeTaxExpenseBenefit 32,950,000us-gaap_IncomeTaxExpenseBenefit 28,722,000us-gaap_IncomeTaxExpenseBenefit 32,023,000us-gaap_IncomeTaxExpenseBenefit
Effective tax rate   22.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 20.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 23.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Indefinitely reinvested foreign earnings   650,800,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Components of Deferred Tax Assets        
Accruals and other reserves   5,100,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 8,459,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals  
Net operating loss carry forward   3,043,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 4,580,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Stock compensation   9,865,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 8,957,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Other deferred tax assets   8,375,000us-gaap_DeferredTaxAssetsOther 3,937,000us-gaap_DeferredTaxAssetsOther  
Valuation allowance   (1,940,000)us-gaap_DeferredTaxAssetsValuationAllowance (3,351,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Total deferred tax assets   24,443,000us-gaap_DeferredTaxAssetsNet 22,582,000us-gaap_DeferredTaxAssetsNet  
Components of Deferred Tax Liabilities        
Deferred gains on sales of properties   (1,756,000)plt_DeferredTaxLiabilitiesDeferredGainOnSaleOfProperty (1,756,000)plt_DeferredTaxLiabilitiesDeferredGainOnSaleOfProperty  
Unremitted earnings of certain subsidiaries   (3,064,000)plt_DeferredTaxLiabilitiesUnremittedEarningsSubsidiaries (3,064,000)plt_DeferredTaxLiabilitiesUnremittedEarningsSubsidiaries  
Fixed asset depreciation   (4,650,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (3,571,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Total deferred tax liabilities   (9,470,000)us-gaap_DeferredTaxLiabilities (8,391,000)us-gaap_DeferredTaxLiabilities  
Net deferred tax assets   14,973,000us-gaap_DeferredTaxAssetsLiabilitiesNet [1] 14,191,000us-gaap_DeferredTaxAssetsLiabilitiesNet [1]  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Balance at beginning of period   12,571,000us-gaap_UnrecognizedTaxBenefits 11,072,000us-gaap_UnrecognizedTaxBenefits 11,141,000us-gaap_UnrecognizedTaxBenefits
Increase (decrease) of unrecognized tax benefits related to prior years   (244,000)plt_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions 641,000plt_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions (117,000)plt_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions
Increase of unrecognized tax benefits related to the current year   1,908,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 2,427,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 2,430,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reductions to unrecognized tax benefits related to lapse of applicable statute of limitations   (1,414,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (1,569,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (2,382,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance at end of period 11,072,000us-gaap_UnrecognizedTaxBenefits 12,821,000us-gaap_UnrecognizedTaxBenefits 12,571,000us-gaap_UnrecognizedTaxBenefits 11,072,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Interest on Income Taxes Accrued   1,800,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 1,700,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued  
Accrued penalties related to unrecognized tax benefits   $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued  
[1] The long-term portion of the Company's deferred tax assets for the fiscal years ending March 31, 2015 and March 31, 2014, are included as a component of other assets on the consolidated balance sheets.