Retirement Plans - Fair Value of Defined Benefit Plans' Assets by Asset Fair Value Hierarchy Level (Detail) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 851,283	$ 799,166
Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	528,984	489,310
Total Investments Measured at Net Asset Value as a Practical Expedient [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	322,299	309,856
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,898	10,073
Mutual Funds [Member] | Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37,163	37,711
Mutual Funds [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32,033	28,975
Debt Securities [Member] | Domestic Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	223,604	196,743
Debt Securities [Member] | Foreign Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26,360	20,120
Debt Securities [Member] | U.S. Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	154,906	154,007
Debt Securities [Member] | US Government Agencies Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,517	7,548
Debt Securities [Member] | Other Debt Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,437	2,545
Common Collective Trust Funds [Member] | Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	249,366	244,152
Common Collective Trust Funds [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	62,651	59,257
Common Collective Trust Funds [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,282	6,447
Equity Securities [Member] | Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,967
Equity Securities [Member] | Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		30,759
Equity Securities [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,099
Equity Securities [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		829
Level 1 [Member] | Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	112,160	108,347
Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,898	10,073
Level 1 [Member] | Mutual Funds [Member] | Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37,163	37,711
Level 1 [Member] | Mutual Funds [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32,033	28,975
Level 1 [Member] | Equity Securities [Member] | Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,967
Level 1 [Member] | Equity Securities [Member] | Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		30,759
Level 1 [Member] | Equity Securities [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,099
Level 1 [Member] | Equity Securities [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		829
Level 2 [Member] | Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	416,824	380,963
Level 2 [Member] | Debt Securities [Member] | Domestic Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	223,604	196,743
Level 2 [Member] | Debt Securities [Member] | Foreign Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26,360	20,120
Level 2 [Member] | Debt Securities [Member] | U.S. Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	154,906	154,007
Level 2 [Member] | Debt Securities [Member] | US Government Agencies Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,517	7,548
Level 2 [Member] | Debt Securities [Member] | Other Debt Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 4,437	$ 2,545