Earnings Per Share - Computation of Basic and Diluted EPS (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Net income	$ 5,738	$ 5,863	$ 13,632	$ 10,281
Denominator:
Weighted-average common shares outstanding	23,714	23,285	23,697	23,320
Net common stock equivalents assuming the exercise of in-the-money stock options	15	186	15	176
Weighted-average common and common equivalent shares outstanding, assuming dilution	23,729	23,471	23,712	23,496
Earnings Per Share:
Basic	$ 0.24	$ 0.25	$ 0.58	$ 0.44
Diluted	$ 0.24	$ 0.25	$ 0.57	$ 0.44