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Summary of Significant Accounting Policies (Goodwill) (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Goodwill [Line Items]        
Number of reportable segments | segment   2    
Goodwill   $ 131,995 $ 109,448 $ 100,183
Market Capitalization $ 269,400      
Minimum        
Goodwill [Line Items]        
Control premium percent 16.60%      
Maximum        
Goodwill [Line Items]        
Control premium percent 24.40%      
M2M        
Goodwill [Line Items]        
Goodwill $ 98,600 98,981 98,496  
Percent fair value in excess of carrying value of goodwill 7.00%      
Solutions        
Goodwill [Line Items]        
Goodwill $ 32,500 $ 33,014 $ 10,952  
Percent fair value in excess of carrying value of goodwill 8.00%