Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Business Acquisition [Line Items]
Accrued wages and benefits	$ 23,936,000	$ 19,622,000
Accrued legal costs	6,179,000	8,402,000
Accrued warranty obligations	11,738,000	17,617,000	$ 15,362,000
Accrued contract costs	10,016,000	8,644,000
Accrued commissions and royalties	4,654,000	3,600,000
Other	8,511,000	10,725,000
Accrued expenses and other current liabilities	65,034,000	68,610,000
Accrued employee tax withholdings	2,963,000	0
TeleCommunication Systems, Inc. | Pre-Acquisition Contingencies Related To TCS Intellectual Property
Business Acquisition [Line Items]
Accrued legal costs	$ 3,372,000	$ 4,120,000