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Government Subsidies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2020
Aug. 31, 2020
Nov. 30, 2020
Unusual or Infrequent Item, or Both [Line Items]      
Deferred payroll taxes, CARES Act $ 23.6   $ 23.6
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 16.8   24.3
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 0.4   $ 0.6
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 11.0   $ 11.0
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 1.6   4.9
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 | Covid-19 | Payroll Support Program Promissory Note      
Unusual or Infrequent Item, or Both [Line Items]      
Interest rate (as a percent) 1.00%   1.00%