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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% |  |  |

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