Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands	Feb. 28, 2019	May 31, 2018
Information regarding service contracts and other assets
Service contracts, net	$ 508,402	$ 545,768
Other assets, carrying amount	347,150	80,497
Other assets, accumulated amortization	109,299	51,182
Other assets, net	237,851	29,315
Capitalized contract costs
Information regarding service contracts and other assets
Other assets, carrying amount	255,998
Other assets, accumulated amortization	52,736
Other assets, net	203,262
Other assets current	68,400
Noncompete and consulting agreements
Information regarding service contracts and other assets
Other assets, carrying amount	42,163	41,710
Other assets, accumulated amortization	40,382	39,877
Other assets, net	1,781	1,833
Other
Information regarding service contracts and other assets
Other assets, carrying amount	48,989	38,787
Other assets, accumulated amortization	16,181	11,305
Other assets, net	32,808	27,482
Service Contracts
Information regarding service contracts and other assets
Service contracts, carrying amount	929,244	924,978
Service contracts, accumulated amortization	420,842	379,210
Service contracts, net	$ 508,402	$ 545,768