Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net (loss) income	$ (26,525)	$ 44,588
Weighted average shares – basic	45,311	45,010
Net (loss) income per share – basic	$ (0.59)	$ 0.99
Effect of dilutive securities		539
Weighted average shares – diluted	45,311	45,549
Net (loss) income per share - diluted	$ (0.59)	$ 0.98