Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 782	$ 1,350
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	123,840,945	122,006,077
Common stock, shares outstanding (in shares)	73,574,035	72,220,906
Treasury stock, shares (in shares)	50,266,910	49,785,171