Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013
Schedule of Product Warranty Accruals [Abstract]
Balance at beginning of period	$ 4,415	$ 4,580	$ 4,561	$ 4,100
Provision for product warranty - expense	1,296	1,772	1,562	2,401
Adjustments and utilization of warranty accrual	(347)	(2)	(759)	(151)
Current portion	4,833	5,942	4,833	5,942	4,030
Non-current portion	531	408	531	408
Balance at end of period	$ 5,364	$ 6,350	$ 5,364	$ 6,350