Fair Value Measurements - Schedule of Instruments on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Nov. 30, 2020	May 31, 2020
Fair value on a recurring basis
Cash and cash equivalents	$ 703,175	$ 145,402
Other assets, net:
Total assets at fair value	713,009	146,948
Long-term accrued liabilities:
Total liabilities at fair value	138,118	165,686
Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	9,834	1,546
Long-term accrued liabilities:
Interest rate lock agreements	138,118	165,686
Level 1
Fair value on a recurring basis
Cash and cash equivalents	703,175	145,402
Other assets, net:
Total assets at fair value	703,175	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	9,834	1,546
Long-term accrued liabilities:
Total liabilities at fair value	138,118	165,686
Level 2 | Interest rate lock agreements
Other assets, net:
Interest rate lock agreements	9,834	1,546
Long-term accrued liabilities:
Interest rate lock agreements	138,118	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