Retirement Plans - Estimated Future Benefit Payments (Detail) $ in Thousands	Dec. 30, 2017 USD ($)
Pension Benefits [Member]
Defined Benefit Plan Estimated Future Employer Contribution [Line Items]
2018	$ 53,888
2019	46,852
2020	46,232
2021	45,402
2022	45,136
Subsequent five years	224,429
Other Postretirement Plans [Member]
Defined Benefit Plan Estimated Future Employer Contribution [Line Items]
2018	536
2019	527
2020	539
2021	514
2022	495
Subsequent five years	$ 2,368

Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

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