SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 1,090	$ 1,121	$ 1,277
Amounts charged to expenses	3,771	(18)	(113)
Deductions and adjustments	(104)	(13)	(43)
Balance at end of year	4,757	1,090	1,121
Warranty Reserves [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	384	375	360
Amounts charged to expenses	867	1,074	1,161
Adjustments to pre-existing warranty reserve	0	0	0
Settlement of warranty	(892)	(1,065)	(1,146)
Balance at end of year	359	384	375
Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	0
Amounts charged to expenses	1,378
Deductions and adjustments	0
Balance at end of year	$ 1,378