Accrued Expenses (Schedule of Accued Expenses) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Accrued Expenses [Abstract]
Customer deposits	$ 48,337	$ 37,357
Accrued compensation	177,509	113,959
Accrued outside services	45,349	28,822
Accrued insurance	10,897	14,293
Accrued income, sales and other taxes	57,742	10,129
Accrued interest	6,783	5,892
Interest rate cap agreements	22,360	28,131
Pass-through payments	16,799	29,518
Other accrued liabilities	98,517	122,193
Total accrued expenses	$ 484,293	$ 390,294