Organization and Basis of Presentation - Additional Information (Details)					3 Months Ended		9 Months Ended
	Jul. 13, 2021 Restaurant	May 31, 2021 USD ($) Restaurant	Sep. 02, 2020 USD ($)	Apr. 10, 2020 USD ($)	May 31, 2021 USD ($) Restaurant	May 31, 2020 USD ($)	May 31, 2021 USD ($) Restaurant	May 31, 2020 USD ($)	Jun. 30, 2021 Restaurant	Apr. 09, 2021 USD ($)
Revolving Credit Facility Agreement
Organization and Basis of Presentation [Line Items]
Revolving credit line		$ 28,000,000			$ 28,000,000		$ 28,000,000
Kura Japan | Revolving Credit Facility Agreement
Organization and Basis of Presentation [Line Items]
Credit facility maximum borrowing capacity				$ 20,000,000
Revolving credit line, termination date				Mar. 31, 2024
Kura Japan | First Amendment
Organization and Basis of Presentation [Line Items]
Credit facility maximum borrowing capacity			$ 35,000,000
Revolving credit line, termination date			Apr. 10, 2025
Revolving credit line, maturity date description							(i) increase the maximum credit amount under the credit line from $20 million to $35 million, (ii) extend the maturity date for each advance from 12 months to 60 months from the date of disbursement and (iii) extend the last day of the period of availability for the advances under the credit line from March 31, 2024 to April 10, 2025.
Kura Japan | Second Amendment
Organization and Basis of Presentation [Line Items]
Credit facility maximum borrowing capacity										$ 45,000,000
COVID-19
Organization and Basis of Presentation [Line Items]
Employee retention and new hire bonuses		$ 700,000			$ 700,000		$ 700,000
Impairment of long-lived assets							$ 0
COVID-19 | Kura Japan
Organization and Basis of Presentation [Line Items]
Number of restaurants, total | Restaurant		31			31		31
Revolving credit line				$ 20,000,000
COVID-19 | Kura Japan | Revolving Credit Facility Agreement
Organization and Basis of Presentation [Line Items]
Credit facility maximum borrowing capacity										$ 45,000,000
COVID-19 | Kura Japan | Subsequent Event
Organization and Basis of Presentation [Line Items]
Number of restaurants, total | Restaurant	32
Number of new restaurant opened | Restaurant									1
Reduced percentage of capacities	100.00%
CARES Act
Organization and Basis of Presentation [Line Items]
Employee retention credit					$ 6,300,000	$ 1,600,000	$ 8,900,000	$ 1,600,000
CARES Act | General and Administrative Expenses
Organization and Basis of Presentation [Line Items]
Employee retention credit					500,000		900,000
CARES Act | Labor and Related Costs
Organization and Basis of Presentation [Line Items]
Employee retention credit					$ 5,800,000		$ 8,000,000
Minimum | COVID-19 | Kura Japan
Organization and Basis of Presentation [Line Items]
Reduced percentage of capacities		50.00%
Maximum | COVID-19 | Kura Japan
Organization and Basis of Presentation [Line Items]
Reduced percentage of capacities		100.00%