Consolidated Long-Term Debt (Detail) - USD ($) $ in Thousands	Jan. 01, 2017	Jan. 03, 2016
Long Term Debt And Other Financing Arrangement [Line Items]
Capital lease obligations	$ 5,730	$ 5,996
Debt issuance costs, net of accumulated amortization of $21.2 million in 2016 and $14.7 million in 2015	(21,503)	(27,922)
Total debt	2,187,877	2,240,793
Less - current portion	38,887	59,333
Consolidated long-term debt, net of debt issuance costs	2,148,990	2,181,460
Total debt	2,187,877	2,240,793
Series 2012-1 5.216% Fixed Rate Senior Secured Notes [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Fixed rate senior notes	916,650	962,719
3.484% Class A-2-I Notes; expected repayment date October 2020; legal final maturity October 2045 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Fixed rate senior notes	495,000	500,000
4.474% Class A-2-II Notes; expected repayment date October 2025; legal final maturity October 2045 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Fixed rate senior notes	792,000	800,000
2015 Variable Funding Notes [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Variable Funding Notes	$ 0	$ 0

Long Term Debt And Other Financing Arrangement [Line Items]

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The carrying value as of the balance sheet date of the Variable Funding Notes.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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