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