CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 350	$ 350
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000	5,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000	200,000
Common stock, shares issued (in shares)	138,891	137,584
Common stock, shares outstanding (in shares)	115,210	115,163
Treasury stock, shares (in shares)	23,681	22,421