Quarterly Financial Data (Unaudited) - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended			3 Months Ended			12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 SRI Litigation [Member]	Mar. 31, 2012 OctoPlus [Member]	Sep. 30, 2012 Corporate [Member]	Sep. 30, 2013 Corporate [Member]	Sep. 30, 2011 Corporate [Member]
Quarterly Financial Data [Line Items]
Restructuring Charges	$ 500,000		$ 476,000		$ 1,616,000				$ 500,000	$ 1,600,000
Recovery of legal fees associated with litigation						1,000,000
Gain on sale of strategic investment		1,200,000	1,430,000	228,000	380,000
Impairment loss on investment							800,000
Modified tender offer cost				$ 500,000				$ 500,000