Fair Value Measurements - Schedule of Instruments on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Feb. 28, 2021	May 31, 2020
Fair value on a recurring basis
Cash and cash equivalents	$ 553,611	$ 145,402
Other assets, net:
Total assets at fair value	589,425	146,948
Long-term accrued liabilities:
Total liabilities at fair value	62,560	165,686
Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	35,814	1,546
Long-term accrued liabilities:
Interest rate lock agreements	62,560	165,686
Level 1
Fair value on a recurring basis
Cash and cash equivalents	553,611	145,402
Other assets, net:
Total assets at fair value	553,611	145,402
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	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	35,814	1,546
Long-term accrued liabilities:
Total liabilities at fair value	62,560	165,686
Level 2 | Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	35,814	1,546
Long-term accrued liabilities:
Interest rate lock agreements	62,560	165,686
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	0
Long-term accrued liabilities:
Interest rate lock agreements	$ 0	$ 0