Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income (loss)	$ 106,133	$ 54,554	$ 56,953	$ (26,525)	$ 160,687	$ 30,428
Weighted average shares – basic	45,372		45,437		45,475	45,374
Net income (loss) per share - basic	$ 2.34		$ 1.25		$ 3.53	$ 0.67
Effect of dilutive securities	339		456		337	483
Weighted average shares – diluted	45,711		45,893		45,812	45,857
Net income (loss) per share - diluted	$ 2.32		$ 1.24		$ 3.51	$ 0.66