Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Computations (Detail) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Basic EPS
Net income	$ 13,880	$ 21,338	$ 30,828	$ 39,257
Weighted average shares	25,418	24,686	25,575	24,913
Basic income per share	$ 0.55	$ 0.86	$ 1.21	$ 1.58
Diluted EPS
Net income	$ 13,880	$ 21,338	$ 30,828	$ 39,257
Basic weighted average shares	25,418	24,686	25,575	24,913
Net effect of common stock equivalents	425	542	454	546
Diluted weighted average shares	25,843	25,228	26,029	25,459
Diluted income per share	$ 0.54	$ 0.85	$ 1.18	$ 1.54