WARRANTY LIABILITY (Details) - Summary of Changes in Warrant Liability Included in Accrued Liabilities (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance, beginning of period	$ 4,908us-gaap_ProductWarrantyAccrual	$ 6,929us-gaap_ProductWarrantyAccrual	$ 4,934us-gaap_ProductWarrantyAccrual	$ 6,649us-gaap_ProductWarrantyAccrual
Warranties issued and changes in estimated pre-existing warranties	1,842	1,135	2,791	2,101
Actual warranty costs incurred	(1,076)	(953)	(2,051)	(1,639)
Balance, end of period	$ 5,674us-gaap_ProductWarrantyAccrual	$ 7,111us-gaap_ProductWarrantyAccrual	$ 5,674us-gaap_ProductWarrantyAccrual	$ 7,111us-gaap_ProductWarrantyAccrual

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(5))

-URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249

+ Details

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- Definition

Total increases or decreases in the standard and extended product warranty liability during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249

+ Details

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- Definition

Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(3))

-URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249

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