Reconciles Net Income, Most Directly Comparable GAAP Financial Measure to Adjusted EBITDA (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income	$ 22,619	$ 18,442	$ 28,358
(Loss) income from discontinued operations, net of income taxes		(65)	289
Income from continuing operations	22,619	18,507	28,069
Interest expense (income), net	27	45	(151)
Income tax expense (benefit)	9,152	8,060	(9,377)
Depreciation	7,859	6,364	5,147
Amortization of acquired intangible assets	3,799	1,984	1,710
Restructuring	2,821		231
Impairment of long-lived assets		150	211
Acquisition costs and other related expenses	1,219	412
Fair value adjustments from purchase accounting	(5,238)	(219)
Stock-based compensation cost	6,616	5,580	4,016
Adjusted EBITDA	$ 48,874	$ 40,883	$ 29,856