Significant Customers Narrative (Detail)	3 Months Ended		6 Months Ended
	Mar. 31, 2013 customer	Mar. 31, 2012 customer	Mar. 31, 2013 customer	Mar. 31, 2012 customer
Segment Reporting Disclosure [Line Items]
Number of major customer by revenue	1	2	1	1
Percentage of revenues from one customer	13.00%		11.00%	14.00%
Customer One
Segment Reporting Disclosure [Line Items]
Percentage of revenues from one customer		16.00%
Customer Two
Segment Reporting Disclosure [Line Items]
Percentage of revenues from one customer		10.00%