Fair Value Disclosures (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	May 31, 2020	May 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 145,402	$ 96,645
Other assets, net
Interest rate lock agreements	1,546
Total assets at fair value	146,948	96,645
Long-term accrued liabilities:
Interest rate lock agreements	165,686	36,393
Total liabilities at fair value	165,686	36,393
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	145,402	96,645
Other assets, net
Interest rate lock agreements	0
Total assets at fair value	145,402	96,645
Long-term accrued liabilities:
Interest rate lock agreements	0	0
Total liabilities at fair value	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Other assets, net
Interest rate lock agreements	1,546
Total assets at fair value	1,546	0
Long-term accrued liabilities:
Interest rate lock agreements	165,686	36,393
Total liabilities at fair value	165,686	36,393
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Other assets, net
Interest rate lock agreements	0
Total assets at fair value	0	0
Long-term accrued liabilities:
Interest rate lock agreements	0	0
Total liabilities at fair value	$ 0	$ 0