Share-based Compensation - Principal Assumptions Utilized in Valuing Market Condition SSARs (Details) - Stock Settled Stock Appreciation Rights (SSARS) [Member] - Lattice Option Pricing Model - $ / shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	0.60%	1.40%
Expected volatility, minimum	40.00%	31.70%
Suboptimal exercise factor	2.50x	3.0x
Weighted average grant date fair value (in dollars per share)	$ 19.55	$ 9.60