Accrued Expenses and Other Current Liabilities - Schedule of Product Warranty Accruals (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Movement in Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 4,561	$ 4,100	$ 4,158
Provision for product warranty - expense	2,114	2,914	(49)
Adjustments and utilization of warranty accrual	(3,057)	(2,453)	(9)
Current portion	3,087	4,030	3,692
Non-current portion	531	531	408
Balance at end of period	$ 3,618	$ 4,561	$ 4,100