WARRANTY LIABILITY (Detail) - Summary of changes in warrant liability included in Accrued liabilities (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Balance, beginning of period	$ 10,356	$ 6,513	$ 7,963	$ 6,719
Warranties issued and charges in estimated pre-existing warranties	579	1,154	5,525	2,830
Actual warranty costs incurred	(1,174)	(988)	(3,727)	(2,870)
Balance, end of period	$ 9,761	$ 6,679	$ 9,761	$ 6,679