Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jul. 28, 2017	Jul. 29, 2016	Apr. 28, 2017	May 01, 2017
Accounting Policies [Line Items]
Cost of goods sold	$ 75,851,000	$ 57,420,000
Promotional spending	17,881,000	16,291,000
Advertising and marketing costs	3,063,000	3,239,000
Distribution costs	5,364,000	3,949,000
Selling costs	4,447,000	3,713,000
Allowance for doubtful accounts receivable	542,000		$ 269,000
Accounts receivable reduction related to sales promotions	6,958,000		8,055,000
Raw materials and supplies	9,399,000		6,037,000
Finished goods	12,771,000		11,173,000
Depreciation	6,545,000	5,095,000
Current assets held for sale	3,334,000		3,334,000
Goodwill	101,299,000		19,634,000
Impairment of goodwill	0		0
Other intangible assets, net	34,629,000		39,000
Amortization of intangible assets	$ 901,000	$ 39,000
Dilutive shares not included in computation of dilutive earnings per share (in shares)	29,307	313,382
Cash dividends (in dollars per share)	$ 7.84	$ 0.34
Special dividend cash paid (in dollars per share)	7.50
Quarterly dividend payment (in dollars per share)	$ 0.34
Accrued non-income taxes	$ 1,678,000		3,353,000
Self-insurance reserves	7,867,000		10,692,000
Self-insurance reserves, noncurrent	$ 2,357,000		$ 2,814,000
Building and Improvements | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful lives	5 years
Building and Improvements | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful lives	25 years
Machinery and Equipment | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful lives	3 years
Machinery and Equipment | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful lives	10 years
Pineland Farms Potato Company, Inc.
Accounting Policies [Line Items]
Goodwill				$ 81,665,000
Trade Names | Pineland Farms Potato Company, Inc.
Accounting Policies [Line Items]
Economic useful life	20 years
Customer relationships | Pineland Farms Potato Company, Inc.
Accounting Policies [Line Items]
Economic useful life	10 years
Noncompete Agreements | Kettle Creations
Accounting Policies [Line Items]
Economic useful life	5 years
Restatement Adjustment
Accounting Policies [Line Items]
Cost of goods sold	$ 25,524,000	$ 19,406,000