Segment Information Total Assets (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Sep. 30, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		$ 360,226	$ 345,189
IoT Products & Services
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		210,118	182,555
IoT Solutions
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		95,408	47,644
Unallocated
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	[1]	$ 54,700	$ 114,990

[1] Unallocated consists of cash and cash equivalents, current marketable securities and long-term marketable securities.