Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2020

Fair Value Measurements [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

			Quoted in		Significant Other		Significant
	Balance at		Identical Markets		Observable Inputs		Unobservable Inputs
Description	September 30, 2020		(Level 1)		(Level 2)		(Level 3)
Interest rate cap agreements	$	(39,335)	$	—	$	(39,335)	$	—
Contingent consideration obligation		—		—		—		—
Total	$	(39,335)	$	—	$	(39,335)	$	—

			Quoted in		Significant Other		Significant
	Balance at		Identical Markets		Observable Inputs		Unobservable Inputs
Description	March 31, 2020		(Level 1)		(Level 2)		(Level 3)
Interest rate cap agreements	$	(47,408)	$	—	$	(47,408)	$	—
Contingent consideration obligation		(3,000)		—		—		(3,000)
Total	$	(50,408)	$	—	$	(47,408)	$	(3,000)

Reconciliation of Fair Value Derivative Using Unobservable Inputs

		Three Months Ended September 30,			Six Months Ended September 30,
	2020		2019		2020			2019
Balance at beginning of period	$	(550)	$	—	$	(3,000)	$	—
Gain/(loss) included in contingent consideration		550		—		3,000		—
Balance at end of period	$	—	$	—	$	—	$	—

Carrying Amount and Estimated Fair Value of Financial Instruments

	September 30, 2020				March 31, 2020
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Cash and cash equivalents	$	167,477	$	167,477	$	410,405	$	410,405
Accounts receivable	$	626,991	$	626,991	$	740,105	$	740,105
Investment in business purchase option	$	—	$	—	$	146,500	$	146,500
Senior Credit Facilities (Level 2)	$	3,648,824	$	3,678,387	$	3,682,457	$	3,452,687
Senior Notes (Level 2)	$	1,317,305	$	1,315,063	$	997,772	$	950,000
Debt component of tangible equity units (Level 2)	$	28,058	$	28,624	$	35,431	$	34,806