Fair Value Measurements - Schedule of Instruments on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Nov. 30, 2019	May 31, 2019
Fair value on a recurring basis
Cash and cash equivalents	$ 226,535	$ 96,645
Other assets, net:
Total assets at fair value	238,776	96,645
Long-term accrued liabilities:
Total liabilities at fair value	58,274	36,393
Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	12,241
Long-term accrued liabilities:
Interest rate lock agreements	58,274	36,393
Level 1
Fair value on a recurring basis
Cash and cash equivalents	226,535	96,645
Other assets, net:
Total assets at fair value	226,535	96,645
Long-term accrued liabilities:
Total liabilities at fair value	0	0
Level 1 | Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	0
Long-term accrued liabilities:
Interest rate lock agreements	0	0
Level 2
Fair value on a recurring basis
Cash and cash equivalents	0	0
Other assets, net:
Total assets at fair value	12,241	0
Long-term accrued liabilities:
Total liabilities at fair value	58,274	36,393
Level 2 | Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	12,241
Long-term accrued liabilities:
Interest rate lock agreements	58,274	36,393
Level 3
Fair value on a recurring basis
Cash and cash equivalents	0	0
Other assets, net:
Total assets at fair value	0	0
Long-term accrued liabilities:
Total liabilities at fair value	0	0
Level 3 | Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	0
Long-term accrued liabilities:
Interest rate lock agreements	$ 0	$ 0