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Summary of Significant Accounting Policies (Goodwill) (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2018
USD ($)
segment
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Goodwill [Line Items]        
Number of reportable segments | segment 2      
Goodwill $ 154,535   $ 131,995 $ 109,448
Market Capitalization   $ 359,600    
IoT Products & Services        
Goodwill [Line Items]        
Goodwill 104,358 $ 104,600 98,981  
Percent fair value in excess of carrying value of goodwill   36.00%    
IoT Solutions        
Goodwill [Line Items]        
Goodwill $ 50,177 $ 50,000 $ 33,014  
Percent fair value in excess of carrying value of goodwill   7.00%    
Measurement Input, Control Premium [Member] | Minimum        
Goodwill [Line Items]        
Goodwill Valuation Implied Control Premium   5.70%    
Measurement Input, Control Premium [Member] | Maximum        
Goodwill [Line Items]        
Goodwill Valuation Implied Control Premium   16.40%