Summary of Significant Accounting Policies Revenue Details (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 28, 2019	Nov. 30, 2018	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with Customer, Liability, Revenue Recognized		$ 20,100,000
Future Revenues	$ 13,800,000		$ 1,300,000	$ 1,500,000	$ 16,100,000
Revenue, Remaining Performance Obligation		$ 32,700,000