Goodwill, Service Contracts and Other Assets - Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Goodwill, Service Contracts And Other Assets [Abstract]
Amortization expense for service contracts and other assets	$ 36,900	$ 35,400	$ 73,400	$ 70,500
2022 (remaining six months)	70,680		70,680
2023	126,611		126,611
2024	114,179		114,179
2025	99,707		99,707
2026	82,616		82,616
Thereafter	213,745		213,745
Total future amortization expense	$ 707,538		$ 707,538