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Accounting For Share-Based Payments - Textuals (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
May 02, 2015
May 03, 2014
Nov. 02, 2013
Nov. 02, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized      
Share-based Compensation Arrangement by Share-based Payment Award, Annual Percentage Increase in Shares Authorized 1.50%perf_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualPercentageIncreaseInSharesAuthorized      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options 1,961,898us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions      
Share-based compensation expense $ 100us-gaap_AllocatedShareBasedCompensationExpense $ 105us-gaap_AllocatedShareBasedCompensationExpense $ 105us-gaap_AllocatedShareBasedCompensationExpense $ 312us-gaap_AllocatedShareBasedCompensationExpense
The 2010 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding at end of period (number of shares) 920,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= perf_A2010PlanMember