Consolidated Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 30, 2018	Dec. 31, 2017
Long Term Debt And Other Financing Arrangement [Line Items]
Capital lease obligations	$ 17,006	$ 5,437
Debt issuance costs, net of accumulated amortization of $8.2 million in 2018 and $6.8 million in 2017	(27,547)	(27,373)
Total debt	3,531,584	3,153,814
Less - current portion	35,893	32,324
Consolidated long-term debt, net of debt issuance costs	3,495,691	3,121,490
3.484% Class A-2-I Notes; repaid in connection with the 2018 Recapitalization
Long Term Debt And Other Financing Arrangement [Line Items]
Senior notes		492,500
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]
Senior notes	780,000	788,000
3.082% Class A-2-II Notes; expected repayment date July 2022; legal final maturity July 2047 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Senior notes	592,500	598,500
4.118% Class A-2-III Notes; expected repayment date July 2027; legal final maturity July 2047 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Senior notes	987,500	997,500
Floating Rate Class A-2-I Notes; expected repayment date July 2022; legal final maturity July 2047 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Senior notes	296,250	299,250
4.116% Class A-2-I Notes; expected repayment date October 2025; legal final maturity July 2048
Long Term Debt And Other Financing Arrangement [Line Items]
Senior notes	422,875
4.328% Class A-2-II Notes; expected repayment date July 2027; legal final maturity July 2048
Long Term Debt And Other Financing Arrangement [Line Items]
Senior notes	398,000
2017 Variable Funding Notes [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Variable Funding Notes	$ 65,000	$ 0

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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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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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