Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands	Feb. 28, 2021	May 31, 2020
Information regarding service contracts and other assets
Service contracts, net	$ 418,318	$ 451,529
Other assets, carrying amount	581,577	474,041
Other assets, accumulated amortization	277,566	213,283
Other assets, net	304,011	260,758
Capitalized contract costs
Information regarding service contracts and other assets
Other assets, carrying amount	440,202	375,912
Other assets, accumulated amortization	210,862	148,853
Other assets, net	229,340	227,059
Other assets current	79,100	76,200
Noncompete and consulting agreements
Information regarding service contracts and other assets
Other assets, carrying amount	44,431	43,890
Other assets, accumulated amortization	42,077	41,317
Other assets, net	2,354	2,573
Other
Information regarding service contracts and other assets
Other assets, carrying amount	96,944	54,239
Other assets, accumulated amortization	24,627	23,113
Other assets, net	72,317	31,126
Service Contracts
Information regarding service contracts and other assets
Service contracts, carrying amount	954,553	941,383
Service contracts, accumulated amortization	536,235	489,854
Service contracts, net	$ 418,318	$ 451,529