Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Schedule of Product Warranty Accruals [Abstract]
Balance at beginning of period	$ 4,158	$ 4,851	$ 4,287
Provision for product warranty - expense	(49)	970	1,220
Adjustments and utilization of warranty accrual	(417)	(1,663)	(656)
Balance at end of period	$ 3,692	$ 4,158	$ 4,851