WARRANTY LIABILITY (Detail) - Summary of changes in warrant liability included in Accrued liabilities (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Balance, beginning of period	$ 7,743	$ 8,953	$ 8,856	$ 7,963
Warranties issued and changes in estimated pre-existing warranties	662	2,916	656	4,946
Actual warranty costs incurred	(981)	(1,513)	(2,088)	(2,553)
Balance, end of period	$ 7,424	$ 10,356	$ 7,424	$ 10,356