Segment Information Total Assets (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Sep. 30, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		$ 343,702	$ 336,166
M2M
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		184,460	184,917
Solutions
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		47,949	13,599
Unallocated
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	[1]	$ 111,293	$ 137,650

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