Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands	Nov. 30, 2018	May 31, 2018
Information regarding service contracts and other assets
Service contracts, net	$ 521,505	$ 545,768
Other assets, carrying amount	317,844	80,497
Other assets, accumulated amortization	89,458	51,182
Other assets, net	228,386	29,315
Capitalized contract costs
Information regarding service contracts and other assets
Other assets, carrying amount	234,446
Other assets, accumulated amortization	34,726
Other assets, net	199,720
Other assets current	67,000
Noncompete and consulting agreements
Information regarding service contracts and other assets
Other assets, carrying amount	42,116	41,710
Other assets, accumulated amortization	40,190	39,877
Other assets, net	1,926	1,833
Other
Information regarding service contracts and other assets
Other assets, carrying amount	41,282	38,787
Other assets, accumulated amortization	14,542	11,305
Other assets, net	26,740	27,482
Service Contracts
Information regarding service contracts and other assets
Service contracts, carrying amount	928,010	924,978
Service contracts, accumulated amortization	406,505	379,210
Service contracts, net	$ 521,505	$ 545,768