Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands	May 31, 2021	May 31, 2020	May 31, 2019
Information regarding service contracts and other assets
Net	$ 719,864
Other assets, carrying amount	609,133	$ 474,041
Other assets, accumulated amortization	298,719	213,283
Other assets, net	310,414	260,758
Capitalized contract costs
Information regarding service contracts and other assets
Other assets, carrying amount	459,079	375,912
Other assets, accumulated amortization	231,940	148,853
Other assets, net	227,139	227,059
Current portion of capitalized contract costs	79,400	76,200
Noncompete and consulting agreements
Information regarding service contracts and other assets
Other assets, carrying amount	44,683	43,890
Other assets, accumulated amortization	42,408	41,317
Other assets, net	2,275	2,573
Other
Information regarding service contracts and other assets
Other assets, carrying amount	105,371	54,239
Other assets, accumulated amortization	24,371	23,113
Other assets, net	81,000	31,126
Service contracts
Information regarding service contracts and other assets
Service contracts, carrying amount	961,942	941,383
Service contracts, accumulated amortization	553,497	489,854
Net	$ 408,445	$ 451,529	$ 494,595