Acquisitions and Divestitures - Additional Information (Detail) - USD ($)							3 Months Ended	12 Months Ended
	Mar. 31, 2017	Jan. 27, 2017	Oct. 28, 2016	Apr. 29, 2016	Apr. 01, 2016	Jan. 29, 2016	Apr. 02, 2017	Jan. 01, 2017	Apr. 03, 2016
Business Acquisition [Line Items]
Transaction related expenses incurred							$ 700,000		$ 900,000
Easton and Salisbury, Maryland and Richmond and Yorktown, Virginia Expansion Territories Acquisitions and Sandston, Virginia Expansion Facility Acquisition [Member]
Business Acquisition [Line Items]
Effective date of business acquisition								Jan. 29, 2016
Cash purchase						$ 65,700,000
Goodwill recognized, expected to be deductible for tax purposes						$ 6,000,000
Alexandria, Virginia and Capitol Heights and La Plata, Maryland Expansion Territories Acquisitions [Member]
Business Acquisition [Line Items]
Goodwill recognized, expected to be deductible for tax purposes					$ 0
Alexandria, Virginia and Capitol Heights and La Plata, Maryland Expansion Territories Acquisitions [Member] | CCR [Member]
Business Acquisition [Line Items]
Effective date of business acquisition								Apr. 01, 2016
Cash purchase					$ 35,600,000
Baltimore, Hagerstown and Cumberland, Maryland Expansion Territories Acquisitions and Silver Spring and Baltimore, Maryland Expansion Facilities Acquisitions [Member]
Business Acquisition [Line Items]
Effective date of business acquisition								Apr. 29, 2016
Cash purchase				$ 69,000,000
Goodwill recognized, expected to be deductible for tax purposes				$ 0
Cincinnati, Dayton, Lima and Portsmouth, Ohio and Louisa, Kentucky Expansion Territories Acquisitions and Cincinnati, Ohio Expansion Facility Acquisition [Member]
Business Acquisition [Line Items]
Effective date of business acquisition								Oct. 28, 2016
Cash purchase			$ 98,200,000
Goodwill recognized, expected to be deductible for tax purposes			$ 13,100,000
Anderson, Fort Wayne, Lafayette, South Bend and Terre Haute, Indiana Expansion Territories Acquisitions [Member] | CCR [Member] | Distribution Assets and Working Capital [Member]
Business Acquisition [Line Items]
Cash purchase		$ 31,600,000
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
Anderson Fort Wayne Lafayette South Bend And Terre Haute Indiana Acquisitions [Member]
Business Acquisition [Line Items]
Goodwill recognized, expected to be deductible for tax purposes	$ 0	$ 0
Anderson Fort Wayne Lafayette South Bend And Terre Haute Indiana Acquisitions [Member] | CCR [Member]
Business Acquisition [Line Items]
Effective date of business acquisition							Jan. 27, 2017
Asset Purchase Agreements [Member]
Business Acquisition [Line Items]
Contingent consideration liability range, low								$ 20,000,000
Contingent consideration liability range, high								$ 36,000,000