Accrued Expenses and Other Current Liabilities (Schedule of Restructuring and Related Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 642	$ 1,448
Expense - charged to accrual	1,994	728
Payments and accrual adjustments	(2,008)	(1,534)
Ending Balance	628	642
Severance-related accruals [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	642	1,110
Expense - charged to accrual	1,994	728
Payments and accrual adjustments	(2,008)	(1,196)
Ending Balance	628	642
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0	338
Expense - charged to accrual	0	0
Payments and accrual adjustments	0	(338)
Ending Balance	$ 0	$ 0