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Government Subsidies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Aug. 31, 2020
Nov. 30, 2021
Nov. 30, 2020
May 31, 2021
Cost of sales            
Unusual or Infrequent Item, or Both [Line Items]            
Contra-expense recognized for grant received from the Payroll Support Program under the CARES Act           $ 47.5
Selling, general and administrative expenses            
Unusual or Infrequent Item, or Both [Line Items]            
Contra-expense recognized for grant received from the Payroll Support Program under the CARES Act           $ 1.0
Covid-19            
Unusual or Infrequent Item, or Both [Line Items]            
Period for repayment of deferred payroll taxes, CARES Act       2 years    
Deferred payroll taxes, CARES Act $ 12.4     $ 12.4    
Proceeds From Government Assistance Cares Act     $ 57.2      
Grant proceeds to be used for payment of employee wages, salaries and benefits under the CARES Act       48.5    
Foreign subsidies received related to COVID-19 2.5 $ 1.6   2.8 $ 4.9  
Covid-19 | Accrued Liabilities            
Unusual or Infrequent Item, or Both [Line Items]            
Deferred payroll taxes, CARES Act 6.2     6.2    
Covid-19 | Other liabilities            
Unusual or Infrequent Item, or Both [Line Items]            
Deferred payroll taxes, CARES Act 6.2     6.2    
Covid-19 | Payroll Support Program Promissory Note            
Unusual or Infrequent Item, or Both [Line Items]            
Promissory note proceeds $ 8.7     $ 8.7    
Debt instrument term       10 years    
First five years | Covid-19 | Payroll Support Program Promissory Note            
Unusual or Infrequent Item, or Both [Line Items]            
Interest rate (as a percent) 1.00%     1.00%    
Six to ten years | Covid-19 | Payroll Support Program Promissory Note            
Unusual or Infrequent Item, or Both [Line Items]            
Interest rate (as a percent) 2.00%     2.00%    
First five years, interest in kind | Covid-19 | Payroll Support Program Promissory Note            
Unusual or Infrequent Item, or Both [Line Items]            
Interest rate (as a percent) 3.00%     3.00%    
Remaining term, interest in kind | Covid-19 | Payroll Support Program Promissory Note            
Unusual or Infrequent Item, or Both [Line Items]            
Annual increase to the interest rate (as a percent) 1.00%     1.00%