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Leases - Narrative (Details)
$ in Thousands
1 Months Ended
Sep. 03, 2015
USD ($)
ft²
renewalOption
May 31, 2021
USD ($)
May 30, 2021
USD ($)
May 31, 2020
USD ($)
Leases [Abstract]        
Leased area | ft² 80,950      
Initial lease term 7 years      
Number of renewal options | renewalOption 2      
Lease renewal term 5 years      
Period after which buyout option is available 7 years      
Gross assets recorded under finance leases     $ 3,800 $ 3,800
Accumulated amortization associated with finance leases     $ 600 $ 500
Initial monthly lease payment $ 34      
Percentage by which monthly payment increases per year 2.40%      
Operating lease, impairment loss   $ 1,700