Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands	Nov. 30, 2020	May 31, 2020
Information regarding service contracts and other assets
Service contracts, net	$ 430,923	$ 451,529
Other assets, carrying amount	536,028	474,041
Other assets, accumulated amortization	255,534	213,283
Other assets, net	280,494	260,758
Capitalized contract costs
Information regarding service contracts and other assets
Other assets, carrying amount	421,993	375,912
Other assets, accumulated amortization	189,988	148,853
Other assets, net	232,005	227,059
Other assets current	78,700	76,200
Noncompete and consulting agreements
Information regarding service contracts and other assets
Other assets, carrying amount	44,383	43,890
Other assets, accumulated amortization	41,836	41,317
Other assets, net	2,547	2,573
Other
Information regarding service contracts and other assets
Other assets, carrying amount	69,652	54,239
Other assets, accumulated amortization	23,710	23,113
Other assets, net	45,942	31,126
Service Contracts
Information regarding service contracts and other assets
Service contracts, carrying amount	951,946	941,383
Service contracts, accumulated amortization	521,023	489,854
Service contracts, net	$ 430,923	$ 451,529