Stock Repurchase Activity (Details) - shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Jan. 31, 2016
Equity [Abstract]
Stock repurchase program, number of shares authorized to be repurchased				15,000,000.0
Repurchased shares under authorization (in shares)	0	0	0
Treasury stock, shares	15,643,408	18,205,142