Acquisitions and Divestitures - Additional Information (Detail) - USD ($)								3 Months Ended	9 Months Ended		12 Months Ended
	Apr. 28, 2017	Mar. 31, 2017	Jan. 27, 2017	Oct. 28, 2016	Apr. 29, 2016	Apr. 01, 2016	Jan. 29, 2016	Jul. 02, 2017	Oct. 01, 2017	Oct. 02, 2016	Jan. 01, 2017	Jan. 01, 2017
Business Acquisition [Line Items]
Transaction related expenses incurred									$ 5,600,000	$ 5,100,000
Anderson, Fort Wayne, Lafayette, South Bend and Terre Haute, Indiana Expansion Territories Acquisitions [Member]
Business Acquisition [Line Items]
Cash purchase			$ 31,600,000
Goodwill recognized, expected to be deductible for tax purposes			$ 0
Bloomington and Indianapolis, Indiana and Columbus and Mansfield, Ohio Expansion Territories Acquisitions and Indianapolis and Portland, Indiana Expansion Facilities Acquisitions [Member]
Business Acquisition [Line Items]
Cash purchase		$ 108,700,000
Goodwill recognized, expected to be deductible for tax purposes		$ 2,100,000
Akron, Elyria, Toledo, Willoughby and Youngstown, Ohio Expansion Territories Acquisitions and Twinsburg, Ohio Expansion Facility Acquisition [Member]
Business Acquisition [Line Items]
Cash purchase	$ 87,700,000
Goodwill recognized, expected to be deductible for tax purposes	$ 15,000,000
2017 Acquisition [Member] | Distribution Agreements [Member]
Business Acquisition [Line Items]
Estimated useful life									40 years
2017 Acquisition [Member] | Customer Lists [Member]
Business Acquisition [Line Items]
Estimated useful life									12 years
Easton and Salisbury, Maryland and Richmond and Yorktown, Virginia Expansion Territories Acquisitions and Sandston, Virginia Expansion Facility Acquisition [Member]
Business Acquisition [Line Items]
Cash purchase							$ 65,700,000
Goodwill recognized, expected to be deductible for tax purposes							$ 15,400,000
Effective date of business acquisition											Jan. 29, 2016
Cash purchase price increase for net working capital and other fair value adjustments								$ 9,400,000
Alexandria, Virginia and Capitol Heights and La Plata, Maryland Expansion Territories Acquisitions [Member]
Business Acquisition [Line Items]
Cash purchase						$ 35,600,000
Goodwill recognized, expected to be deductible for tax purposes						$ 0
Effective date of business acquisition											Apr. 01, 2016
Baltimore, Hagerstown and Cumberland, Maryland Expansion Territories Acquisitions and Silver Spring and Baltimore, Maryland Expansion Facilities Acquisitions [Member]
Business Acquisition [Line Items]
Cash purchase					$ 69,000,000
Goodwill recognized, expected to be deductible for tax purposes					$ 0
Effective date of business acquisition											Apr. 29, 2016
Cincinnati, Dayton, Lima and Portsmouth, Ohio and Louisa, Kentucky Expansion Territories Acquisitions and Cincinnati, Ohio Expansion Facility Acquisition [Member]
Business Acquisition [Line Items]
Cash purchase				$ 98,200,000
Goodwill recognized, expected to be deductible for tax purposes				$ 14,400,000
Effective date of business acquisition											Oct. 28, 2016
2016 Acquisition [Member] | Distribution Agreements [Member]
Business Acquisition [Line Items]
Estimated useful life												40 years
2016 Acquisition [Member] | Customer Lists [Member]
Business Acquisition [Line Items]
Estimated useful life												12 years