Summary of Significant Accounting Policies - Shipping Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Shipping expenses	$ 0.8	$ 1.2	$ 1.6	$ 1.9