Government Subsidies (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Aug. 31, 2021	Aug. 31, 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
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	0.3	$ 3.3
Covid-19 | Accrued Liabilities
Unusual or Infrequent Item, or Both [Line Items]
Deferred payroll taxes, CARES Act	6.2
Covid-19 | Other liabilities
Unusual or Infrequent Item, or Both [Line Items]
Deferred payroll taxes, CARES Act	6.2
Covid-19 | Payroll Support Program Promissory Note
Unusual or Infrequent Item, or Both [Line Items]
Promissory note proceeds	$ 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%
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%
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%
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%