Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Apr. 30, 2017	Jul. 31, 2016	Apr. 30, 2016	Jul. 31, 2015
Business Acquisition [Line Items]
Accrued wages and benefits	$ 23,300,000	$ 23,394,000
Accrued legal costs	11,362,000	32,469,000
Accrued warranty obligations	18,223,000	15,362,000	$ 8,639,000	$ 8,638,000
Accrued acquisition-related costs	0	2,119,000
Accrued contract costs	6,240,000	8,348,000
Accrued commissions and royalties	3,118,000	3,473,000
Other	11,601,000	12,869,000
Accrued expenses and other current liabilities	73,844,000	98,034,000
TeleCommunication Systems Inc. | Pre-Acquisition Contingencies Related to TCS Intellectual Property
Business Acquisition [Line Items]
Accrued legal costs	$ 7,069,000	$ 28,112,000