Reconciles Net Income, Most Directly Comparable GAAP Financial Measure to Adjusted EBITDA (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
(Loss) income from continuing operations	$ (7,200)	$ 2,653
Interest expense, net	6	3
Income tax (benefit) expense	(3,651)	1,314
Depreciation	2,211	1,855
Amortization of acquired intangible assets	1,788	816
Restructuring and other charges	4,984		(2,821)
Acquisition costs and other related expenses	230	25
Fair value adjustments from purchase accounting	925	23
Stock-based compensation expense	2,345	2,040
Adjusted EBITDA	$ 1,638	$ 8,729