Indebtedness and Interest Expense - Schedule of Debt Obligations (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Dec. 31, 2017	Oct. 01, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ (982,700)	$ (986,500)
Unamortized original issue discount	(1,424)	(1,694)
Debt Issuance Costs, Noncurrent, Net	10,433	11,993
Bank indebtedness and other long-term debt, net of deferred financing costs, less current portion	$ 963,243	$ 965,213
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Additional Margin on Basis Spread of Variable Rate			3.25%

Debt Instrument, Additional Margin on Basis Spread of Variable Rate

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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