Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands	Aug. 31, 2018	May 31, 2018
Information regarding service contracts and other assets
Service contracts, net	$ 535,865	$ 545,768
Other assets, carrying amount	357,460	80,497
Other assets, accumulated amortization	70,143	51,182
Other assets, net	287,317	29,315
Capitalization of Contract Costs
Information regarding service contracts and other assets
Other assets, carrying amount	276,873
Other assets, accumulated amortization	17,126
Other assets, net	259,747
Other assets current	65,300
Noncompete and consulting agreements
Information regarding service contracts and other assets
Other assets, carrying amount	42,062	41,710
Other assets, accumulated amortization	40,048	39,877
Other assets, net	2,014	1,833
Other
Information regarding service contracts and other assets
Other assets, carrying amount	38,525	38,787
Other assets, accumulated amortization	12,969	11,305
Other assets, net	25,556	27,482
Service Contracts
Information regarding service contracts and other assets
Service contracts, carrying amount	928,920	924,978
Service contracts, accumulated amortization	393,055	379,210
Service contracts, net	$ 535,865	$ 545,768