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Long-Term Debt (Textual 1 Senior Secured Notes) (Details) (Senior notes, USD $)
In Millions, unless otherwise specified
Oct. 31, 2010
Apr. 04, 2015
May 01, 2013
Jan. 03, 2015
Original 9.125% Secured Senior Notes [Member]
       
Debt Instrument [Line Items]        
Debt instrument, face amount $ 730.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= side_Original9125SecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Debt instrument, interest rate, stated percentage 9.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= side_Original9125SecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
New 9.125% Secured Senior Notes [Member]
       
Debt Instrument [Line Items]        
Debt instrument, face amount     100.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= side_New9125SecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Notes sold at as a percentage of principle amount     106.00%side_NotesSoldatasaPercentageofPrincipleAmount
/ us-gaap_DebtInstrumentAxis
= side_New9125SecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Debt instrument, unamortized discount (premium), net   3.7us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_DebtInstrumentAxis
= side_New9125SecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Debt instrument, interest rate, effective percentage   7.528%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= side_New9125SecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Debt instrument, interest rate, stated percentage     9.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= side_New9125SecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
9.125% notes
       
Debt Instrument [Line Items]        
Debt instrument, face amount   830.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= side_NinePointOneTwoFiveSecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Long-term debt, fair value   $ 729.3us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= side_NinePointOneTwoFiveSecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  $ 652.8us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= side_NinePointOneTwoFiveSecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt instrument, interest rate, stated percentage   9.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= side_NinePointOneTwoFiveSecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember