Business Information - Long-lived Assets by Geographic Areas (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 72,382	$ 85,154
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	44,108	54,013
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 28,274	$ 31,141