CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 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)	5,000,000	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)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	138,846,000	137,584,000
Common stock, shares outstanding (in shares)	116,425,000	115,163,000
Treasury stock, shares (in shares)	22,421,000	22,421,000