Schedule of Changes in Beginning Stockholders' Equity (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Apr. 01, 2017	Mar. 31, 2017
Balance	$ 604,886	$ 529,152	$ 452,071
Common stock, Outstanding	44,200,784		43,673,286
Cumulative effect to increase retained earnings and deferred tax assets		77,081
Common Stock
Balance		$ 437	$ 437
Common stock, Outstanding		43,673,286	43,673,286
Treasury Stock
Balance		$ (46,763)	$ (46,763)
Common stock, Outstanding		1,575,995	1,575,995
Additional Paid in Capital
Balance		$ 567,797	$ 565,962
Cumulative effect to increase retained earnings and deferred tax assets		1,835
Accumulated Deficit
Balance		28,287	(46,959)
Cumulative effect to increase retained earnings and deferred tax assets		75,246
Accumulated Other Comprehensive Income (Loss)
Balance		$ (20,606)	$ (20,606)