Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands	Aug. 31, 2021	May 31, 2021
Information regarding service contracts and other assets
Service contracts, net	$ 403,982	$ 408,445
Other assets, carrying amount	615,611	609,133
Other assets, accumulated amortization	320,292	298,719
Other assets, net	295,319	310,414
Capitalized contract costs
Information regarding service contracts and other assets
Other assets, carrying amount	480,535	459,079
Other assets, accumulated amortization	253,298	231,940
Other assets, net	227,237	227,139
Other assets current	80,200	79,400
Noncompete and consulting agreements
Information regarding service contracts and other assets
Other assets, carrying amount	45,783	44,683
Other assets, accumulated amortization	42,601	42,408
Other assets, net	3,182	2,275
Other
Information regarding service contracts and other assets
Other assets, carrying amount	89,293	105,371
Other assets, accumulated amortization	24,393	24,371
Other assets, net	64,900	81,000
Service Contracts
Information regarding service contracts and other assets
Service contracts, carrying amount	969,728	961,942
Service contracts, accumulated amortization	565,746	553,497
Service contracts, net	$ 403,982	$ 408,445