Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands	Feb. 29, 2020	May 31, 2019
Information regarding service contracts and other assets
Service contracts, net	$ 464,852	$ 494,595
Other assets, carrying amount	445,052	369,630
Other assets, accumulated amortization	192,459	129,315
Other assets, net	252,593	240,315
Capitalized contract costs
Information regarding service contracts and other assets
Other assets, carrying amount	349,988	277,016
Other assets, accumulated amortization	128,722	71,062
Other assets, net	221,266	205,954
Other assets current	74,500	69,600
Noncompete and consulting agreements
Information regarding service contracts and other assets
Other assets, carrying amount	43,573	42,308
Other assets, accumulated amortization	41,143	40,524
Other assets, net	2,430	1,784
Other
Information regarding service contracts and other assets
Other assets, carrying amount	51,491	50,306
Other assets, accumulated amortization	22,594	17,729
Other assets, net	28,897	32,577
Service Contracts
Information regarding service contracts and other assets
Service contracts, carrying amount	941,606	928,635
Service contracts, accumulated amortization	476,754	434,040
Service contracts, net	$ 464,852	$ 494,595