Operating Segments - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended				3 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2014 Source Segment	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 SRI Litigation [Member]	Mar. 31, 2014 Director [Member]	Sep. 30, 2013 Corporate [Member]	Sep. 30, 2012 Corporate [Member]	Sep. 30, 2014 Corporate [Member] Director [Member]	Sep. 30, 2014 Minimum [Member] Revenue [Member] Customer Concentration Risk [Member]	Sep. 30, 2013 Minimum [Member] Revenue [Member] Customer Concentration Risk [Member]	Sep. 30, 2012 Minimum [Member] Revenue [Member] Customer Concentration Risk [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of operating segments		2
Allocated share-based compensation expense		$ 3,337,000	$ 2,552,000	$ 2,671,000		$ 900,000			$ 900,000
Restructuring charges	500,000		476,000				500,000
Legal expenses					1,000,000
Modified tender offer cost								$ 500,000
Percentage of revenue										10.00%	10.00%	10.00%
Number of primary sources of revenue		2