Acquisitions and Divestitures - CGD Services - Assets and liabilities of discontinued (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Assets and liabilities
Total assets	$ 174,200	$ 185,500
Disposed of by sale | Cubic Global Defense Services
Assets and liabilities
Accounts receivable, net	74,710
Other current assets	1,190
Property and equipment, net	466
Goodwill	94,350
Purchased intangibles, net	8,637
Other noncurrent assets	(5,179)
Total assets	174,174
Accounts payable and other liabilities	36,862
Net assets	$ 137,312