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Letter of Credit Facilities - Additional Information (Detail) (Letter of Credit, USD $)
In Millions, unless otherwise specified
May 02, 2015
Letter of Credit
  
Line of Credit Facility [Line Items]  
Line Of Credit, amount expired and not renewed $ 15pery_LineOfCreditFacilityExpiredAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember