Fair Value Measurements - Schedule of Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Nov. 30, 2018	May 31, 2018
Fair value on a recurring basis
Cash and cash equivalents	$ 88,479	$ 138,724
Other assets, net:
Total assets at fair value	90,786	138,724
Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	2,307
Level 1
Fair value on a recurring basis
Cash and cash equivalents	88,479	138,724
Other assets, net:
Total assets at fair value	88,479	138,724
Level 1 | Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	0
Level 2
Fair value on a recurring basis
Cash and cash equivalents	0	0
Other assets, net:
Total assets at fair value	2,307	0
Level 2 | Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	2,307
Level 3
Fair value on a recurring basis
Cash and cash equivalents	0	0
Other assets, net:
Total assets at fair value	0	$ 0
Level 3 | Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	$ 0