Discontinued Operations (Income (loss) from Discontinued Operations, Net of Tax) (Details) - Etherios, Inc. - Discontinued Operations, Disposed of by Sale - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Oct. 23, 2015	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Service revenue		$ 0	$ 2,750	$ 891	$ 4,255
Cost of service		0	1,907	713	4,047
Gross profit		0	843	178	208
Operating expenses:
Sales and marketing		0	424	148	981
Research and development		0	499	103	978
General and administrative		0	191	43	604
Restructuring		0	106	0	106
Total operating expenses		0	1,220	294	2,669
Loss from discontinued operations, before income taxes		0	(377)	(116)	(2,461)
(Loss) gain on sale of discontinued operations, before income taxes	$ 2,870	(42)	0	2,870	0
Total (loss) income from discontinued operations, before income taxes		(42)	(377)	2,754	(2,461)
Income tax expense (benefit) on discontinued operations		47	(161)	(476)	(888)
(Loss) income from discontinued operations, after income taxes		$ (89)	$ (216)	$ 3,230	$ (1,573)