Significant Customers - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Jun. 30, 2012 Customer	Jun. 30, 2011 Customer	Jun. 30, 2012 Customer	Jun. 30, 2011 Customer
Segment Reporting Disclosure [Line Items]
Number of major customer by revenue	2	3	1	3
Revenue from major customers description	The Company had two customers that accounted for more than 10% of revenues, at 14% and 11%, respectively, in the three months ended June 30, 2012.	The Company had three customers that each accounted for more than 10% of revenues, at 17%, 13% and 11%, respectively, in the three months ended June 30, 2011.	The Company had one customer that accounted for more than 10% of revenues, at 14%, in the nine months ended June 30, 2012.	The Company had three customers that each accounted for more than 10% of revenues, at 18%, 14% and 10%, respectively, in the nine months ended June 30, 2011.
Customer 1
Segment Reporting Disclosure [Line Items]
Percentage of revenues by customer	14.00%	17.00%	14.00%	18.00%
Customer 2
Segment Reporting Disclosure [Line Items]
Percentage of revenues by customer	11.00%	13.00%		14.00%
Customer 3
Segment Reporting Disclosure [Line Items]
Percentage of revenues by customer		11.00%		10.00%