Pineland Acquisition - Narrative (Details) - Pineland Farms Potato Company, Inc. lb in Millions		3 Months Ended	6 Months Ended
	May 01, 2017 USD ($) a lb	Oct. 27, 2017 USD ($)	Oct. 27, 2017 USD ($)
Business Acquisition [Line Items]
Potato processing capacity (in pounds) | lb	180
Farmland acquired (acres) | a	900
Cash paid	$ 115,811,000
Cash as potential earn-out consideration	$ 25,000,000
Acquisition, consecutive performance period to achieve earn-out consideration	12 months
Acquisition, additional cash as potential earn-out consideration	$ 23,746,000
Acquisition, measurement period for earn-out consideration	24 months
Identifiable definite-lived intangible assets	$ 36,965,000
Goodwill expected to be tax deductible	0
Adjustment to property plant and equipment		$ 782,000
Adjustments to identifiable intangible assets		1,474,000
Adjustment to deferred tax liabilities		786,000
Adjustment of goodwill		$ 1,470,000
Business integration related costs			$ 579,000
Customer relationships
Business Acquisition [Line Items]
Identifiable definite-lived intangible assets	$ 34,940,000
Amortization period	10 years
Trademark
Business Acquisition [Line Items]
Identifiable definite-lived intangible assets	$ 2,025,000
Amortization period	20 years