WARRANTY LIABILITY (Detail) - Summary of changes in warrant liability included in Accrued liabilities (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Balance, beginning of period	$ 7,963	$ 6,719
Warranties issued and charges in estimated pre-existing warranties	6,088	5,415
Actual warranty costs incurred	(5,195)	(4,171)
Balance, end of period	$ 8,856	$ 7,963