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Goodwill and Other Identifiable Intangible Assets, Net (Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | $ 155,982 | $ 129,921 | $ 155,982 | $ 129,921 | $ 131,995 |  | $ 109,448
IoT Products & Services |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | 105,791 |  | 105,791 |  | 98,981 | $ 98,600 |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  |  |  |  | 7.00% |
IoT Solutions |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | 50,191 |  | 50,191 |  | $ 33,014 | $ 32,500 |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  |  |  |  | 8.00% |
Cost of Sales and General and Administrative Expense |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Amortization expense | $ 2,600 | $ 600 | $ 4,300 | $ 900 |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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