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Geographic Information (Schedule of Revenues from External Customers by Geographical Areas) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Revenues From External Customers And Long Lived Assets [Line Items]      
Total revenues $ 565,243 $ 661,858 $ 647,814
United States      
Revenues From External Customers And Long Lived Assets [Line Items]      
Total revenues 405,298 474,038 365,085
Canada      
Revenues From External Customers And Long Lived Assets [Line Items]      
Total revenues 77,252 101,191 137,684
Middle East and Africa      
Revenues From External Customers And Long Lived Assets [Line Items]      
Total revenues 40,294 40,557 84,330
Europe      
Revenues From External Customers And Long Lived Assets [Line Items]      
Total revenues 26,200 23,567 34,920
Far East      
Revenues From External Customers And Long Lived Assets [Line Items]      
Total revenues 7,895 12,026 15,127
Mexico, Central and South America      
Revenues From External Customers And Long Lived Assets [Line Items]      
Total revenues $ 8,304 $ 10,479 $ 10,668