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INDEBTEDNESS (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 28, 2015
Senior credit facility  
Credit Facilities  
Weighted-average interest rate of senior credit facilities (as a percent) 1.70%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Domestic revolving credit facility  
Credit Facilities  
Letters of credit issued, amount outstanding 53.8us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_DomesticLineOfCreditMember
Foreign credit instrument facility  
Credit Facilities  
Letters of credit issued, amount outstanding 673.8us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_ForeignLineOfCreditMember
Letters of credit under separate arrangements in China and India  
Credit Facilities  
Letters of credit issued, amount outstanding 6.8us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= spw_LetterOfCreditChinaAndIndiaMember