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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% |  |

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