Fair Value Measurements, Assets Measured at Fair Value on a Nonrecurring Basis (Details) $ in Thousands		12 Months Ended
		Jul. 31, 2020 USD ($)	Aug. 02, 2019 USD ($)	Aug. 03, 2018 USD ($)	Oct. 10, 2019 USD ($)
Fair Value Assets Measured on Nonrecurring Basis [Abstract]
Impairment charge		$ 22,496	$ 0	$ 0
Maple Street Biscuit Company [Member] | Nonrecurring [Member]
Fair Value Assets Measured on Nonrecurring Basis [Abstract]
Property and equipment					$ 13,580
Tradename	[1]				20,960
Goodwill					4,690
Total assets at fair value					39,230
Maple Street Biscuit Company [Member] | Nonrecurring [Member] | Cost Approach [Member]
Fair Value Assets Measured on Nonrecurring Basis [Abstract]
Estimated replacement cost per store					$ 500
Maple Street Biscuit Company [Member] | Nonrecurring [Member] | Present Value of Estimated Cash Flow [Member] | Royalty Rate [Member]
Fair Value Assets Measured on Nonrecurring Basis [Abstract]
Tradename, measurement input					0.025
Maple Street Biscuit Company [Member] | Nonrecurring [Member] | Present Value of Estimated Cash Flow [Member] | Discount Rate [Member]
Fair Value Assets Measured on Nonrecurring Basis [Abstract]
Tradename, measurement input					0.120
Maple Street Biscuit Company [Member] | Nonrecurring [Member] | Level 1 [Member]
Fair Value Assets Measured on Nonrecurring Basis [Abstract]
Property and equipment					$ 0
Tradename	[1]				0
Goodwill					0
Total assets at fair value					0
Maple Street Biscuit Company [Member] | Nonrecurring [Member] | Level 2 [Member]
Fair Value Assets Measured on Nonrecurring Basis [Abstract]
Property and equipment					0
Tradename	[1]				0
Goodwill					0
Total assets at fair value					0
Maple Street Biscuit Company [Member] | Nonrecurring [Member] | Level 3 [Member]
Fair Value Assets Measured on Nonrecurring Basis [Abstract]
Property and equipment					13,580
Tradename	[1]				20,960
Goodwill					4,690
Total assets at fair value					$ 39,230

[1] Included in the Consolidated Balance Sheets as intangible assets.