Fair Value Measurement - Non-recurring Fair Value Measurements Related to Impaired Property and Equipment (Details) - USD ($)	3 Months Ended		12 Months Ended
	Nov. 18, 2020	Jun. 03, 2020	Aug. 26, 2020	Aug. 25, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill - Total impairments	$ 0
Operating lease right-of-use assets			$ 16,756,000	$ 0
Total Nonrecurring Fair Value Measurements - Total impairments	$ 85,000		(10,193,000)
Property and equipment, net			100,599,000
Goodwill, carrying value			195,000
Property held for sale			11,249,000
Continuing Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill - Total impairments		$ 0
Operating lease right-of-use assets			5,700,000
Fair Value, Measurements, Nonrecurring | Continuing Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			0
Goodwill - Total impairments			(320,000)
Property held for sale			3,362,000
Property held for sale - Total impairments			(14,000)
Operating lease right-of-use assets			272,000
Operating lease right-of-use assets - Total impairments			(5,380,000)
Total Nonrecurring Fair Value Measurements			4,115,000
Total Nonrecurring Fair Value Measurements - Total impairments			(10,545,000)
Goodwill, carrying value			300,000
Property held for sale			3,400,000
Fair Value, Measurements, Nonrecurring | Continuing Operations | Company-owned restaurants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment related to Company-owned restaurants			481,000
Property and equipment related to company-owned restaurants - Total impairments			(4,831,000)
Property and equipment, net			5,300,000
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Continuing Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			0
Property held for sale			0
Operating lease right-of-use assets			0
Total Nonrecurring Fair Value Measurements			0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Continuing Operations | Company-owned restaurants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment related to Company-owned restaurants			0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Continuing Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			0
Property held for sale			0
Operating lease right-of-use assets			0
Total Nonrecurring Fair Value Measurements			0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Continuing Operations | Company-owned restaurants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment related to Company-owned restaurants			0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Continuing Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			0
Property held for sale			3,362,000
Operating lease right-of-use assets			272,000
Total Nonrecurring Fair Value Measurements			4,115,000
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Continuing Operations | Company-owned restaurants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment related to Company-owned restaurants			$ 481,000