CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowances (in dollars)	$ 445	$ 995
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	135,527,000	134,602,000
Common stock, shares outstanding	113,106,000	112,181,000
Treasury stock, shares	22,421,000	22,421,000