Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands	May 31, 2020	May 31, 2019	May 31, 2018
Information regarding service contracts and other assets
Net	$ 760,607
Other assets, carrying amount	474,041	$ 369,630
Other assets, accumulated amortization	213,283	129,315
Other assets, net	260,758	240,315
Capitalized contract costs
Information regarding service contracts and other assets
Other assets, carrying amount	375,912	277,016
Other assets, accumulated amortization	148,853	71,062
Other assets, net	227,059	205,954
Current portion of capitalized contract costs	76,200	69,600
Noncompete and consulting agreements
Information regarding service contracts and other assets
Other assets, carrying amount	43,890	42,308
Other assets, accumulated amortization	41,317	40,524
Other assets, net	2,573	1,784
Other
Information regarding service contracts and other assets
Other assets, carrying amount	54,239	50,306
Other assets, accumulated amortization	23,113	17,729
Other assets, net	31,126	32,577
Service contracts
Information regarding service contracts and other assets
Service contracts, carrying amount	941,383	928,635
Service contracts, accumulated amortization	489,854	434,040
Net	$ 451,529	$ 494,595	$ 545,768