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Stock Plans Stock Plans (Textual) (Details) (USD $)
12 Months Ended 3 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Oct. 01, 2011
Jul. 02, 2011
Nov. 06, 2014
Oct. 12, 2010
Stock Plans Textual [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant           7,550,076us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized 6,150,076us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-Based Compensation Arrangement by Share-based Payment Award, Increase in Number of Shares Authorized 1,400,000side_ShareBasedCompensationArrangementbySharebasedPaymentAwardIncreaseinNumberofSharesAuthorized            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 5.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 4.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 4.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition $ 13,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized            
Stock-based compensation expense 500,000us-gaap_ShareBasedCompensation 200,000us-gaap_ShareBasedCompensation 100,000us-gaap_ShareBasedCompensation        
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options 0us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 3,598,963us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross            
Stock Options [Member]              
Stock Plans Textual [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Shares Affected       2,400,000side_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNumberOfSharesAffected
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
500,000side_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNumberOfSharesAffected
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Employees Affected       43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNumberOfEmployeesAffected
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNumberOfEmployeesAffected
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Modification Plan, Weighted Average Exercise Price Prior to Modification       $ 19.25side_ShareBasedCompensationArrangementByShareBasedPaymentAwardModificationPlanWeightedAverageExercisePricePriorToModification
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 10.00side_ShareBasedCompensationArrangementByShareBasedPaymentAwardModificationPlanWeightedAverageExercisePricePriorToModification
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Modification Plan, Average Remaining Contractual Life       9 years 3 months 20 days 9 years 3 months 20 days    
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost       $ 1,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Time-based Options [Member]              
Stock Plans Textual [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Annual Percentage of Vesting 20.00%side_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAnnualPercentageOfVesting
/ us-gaap_AwardTypeAxis
= side_TimeBasedOptionsMember
           
Performance Shares [Member]              
Stock Plans Textual [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Annual Percentage of Vesting 20.00%side_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAnnualPercentageOfVesting
/ us-gaap_AwardTypeAxis
= side_PerformanceBasedOptionsMember
           
Equity Option [Member]              
Stock Plans Textual [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 3,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
           
Performance Shares [Member]              
Stock Plans Textual [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0.00us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember