Annual report pursuant to Section 13 and 15(d)

Schedule II Valuation and Qualifying Accounts (Details)

v2.4.1.9
Schedule II Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 1,079us-gaap_ValuationAllowancesAndReservesBalance $ 1,313us-gaap_ValuationAllowancesAndReservesBalance $ 1,203us-gaap_ValuationAllowancesAndReservesBalance
Charged to (Reduction of) Cost and Expenses 667us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense (192)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 928us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Deductions (632)us-gaap_ValuationAllowancesAndReservesDeductions (42)us-gaap_ValuationAllowancesAndReservesDeductions 818us-gaap_ValuationAllowancesAndReservesDeductions
Balance at End of Period 1,114us-gaap_ValuationAllowancesAndReservesBalance 1,079us-gaap_ValuationAllowancesAndReservesBalance 1,313us-gaap_ValuationAllowancesAndReservesBalance
Other Expense [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Charged to (Reduction of) Cost and Expenses 107us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherExpenseMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember
   
Palmer of Texas [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Charged to (Reduction of) Cost and Expenses 821us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_BusinessAcquisitionAxis
= synl_PalmerOfTexasMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember
   
Specialty Pipe And Tube, Inc. [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Charged to (Reduction of) Cost and Expenses 76us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_BusinessAcquisitionAxis
= synl_SpecialtyPipeAndTubeInc.Member
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember
   
Notes Receivable [Member] | Palmer of Texas [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Charged to (Reduction of) Cost and Expenses $ 821us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_NotesReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= synl_PalmerOfTexasMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember