Post-Retirement Plans - Additional Information (Detail) - USD ($)	4 Months Ended
Apr. 23, 2016	Apr. 25, 2015
Compensation And Retirement Disclosure [Abstract]
Expected pension income for fiscal 2016	$ 0
Total cost and employer contributions	$ 9,200,000	$ 8,500,000

The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration