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Goodwill and Other Intangible Assets (Table 2 Intangibles) (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 04, 2015
Jan. 03, 2015
Finite-Lived Intangible Assets, Net    
Amortized Intangible Assets, Cost $ 318,807us-gaap_FiniteLivedIntangibleAssetsGross $ 321,856us-gaap_FiniteLivedIntangibleAssetsGross
Amortized Intangible Assets, Accumulated Amortization 111,779us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 106,671us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Amortized Intangible Assets, Net Carrying Value 207,028us-gaap_FiniteLivedIntangibleAssetsNet 215,185us-gaap_FiniteLivedIntangibleAssetsNet
Intangible Assets, Net (Excluding Goodwill)    
Amortized and Non-amortized Intangible Assets, Cost (Excluding Goodwill) 537,211side_FiniteLivedIntagiblesAndIndefiniteLivedIntangiblesExcludingGoodwill 543,971side_FiniteLivedIntagiblesAndIndefiniteLivedIntangiblesExcludingGoodwill
Amortized and Non-amortized Intangible Assets, Net (Excluding Goodwill) 425,432us-gaap_IntangibleAssetsNetExcludingGoodwill 437,300us-gaap_IntangibleAssetsNetExcludingGoodwill
Non-amortized trade names    
Intangible Assets, Net (Excluding Goodwill)    
Non-amortized Intangible Assets, Cost 218,404us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
222,115us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Amortized customer bases    
Finite-Lived Intangible Assets, Net    
Amortized Intangible Assets, Cost 318,787us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
321,836us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Amortized Intangible Assets, Accumulated Amortization 111,762us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
106,655us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Amortized Intangible Assets, Net Carrying Value 207,025us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
215,181us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Amortized non-compete agreements    
Finite-Lived Intangible Assets, Net    
Amortized Intangible Assets, Cost 20us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
20us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Amortized Intangible Assets, Accumulated Amortization 17us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
16us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Amortized Intangible Assets, Net Carrying Value $ 3us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
$ 4us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember