Segment Information Reconciliation of Reportable Segment Operating Income (Loss) to Corresponding Consolidated Amounts (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Amortization of acquired intangible assets	$ 1,606	$ 1,399	$ 4,522	$ 4,255
Restructuring and other charges	3,122	560	4,641	6,001
Impairment of variable interest entity note receivable	2,621	0	2,621	0
Other unallocated corporate expenses	1,686	186	1,903	1,470
Operating income (loss)	(5,910)	2,133	(2,056)	(15,505)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	$ 3,125	$ 4,278	$ 11,631	$ (3,779)