Accrued Expenses and Other Current Liabilities (Schedule of Restructuring and Related Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 1,448	$ 1,317
Expense - charged to accrual	728	1,953
Payments and accrual adjustments	(1,534)	(1,822)
Ending Balance	642	1,448
Severance-related accruals [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	1,110	1,317
Expense - charged to accrual	728	1,216
Payments and accrual adjustments	(1,196)	(1,423)
Ending Balance	642	1,110
Restructuring-related accruals [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	338	0
Expense - charged to accrual	0	737
Payments and accrual adjustments	(338)	(399)
Ending Balance	$ 0	$ 338