Accrued Expenses and Other Current Liabilities (Narrative) (Details)	12 Months Ended
	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($) credit	Jul. 31, 2017 USD ($)	Aug. 01, 2018 USD ($)
Accrued Expenses And Other Current Liabilities [Line Items]
Accrued expenses and other current liabilities	$ 78,584,000	$ 65,034,000		$ 62,955,000
Contract liabilities, current and non-current				44,220,000
Accrued warranty obligations	15,968,000	11,738,000	$ 17,617,000
Other	16,365,000	8,511,000
Contract liabilities	38,682,000	34,452,000
Accrued employee tax withholdings	1,787,000	2,963,000
Accrued contract costs	15,007,000	10,016,000
Settlement of intellectual property litigation	$ 3,204,000	$ 0	$ 12,020,000
Minimum coverage period of product warranty from the date of shipment	1 year
Number of monthly credits issued | credit		36
Amount of monthly credit		$ 153,000
TeleCommunication Systems, Inc. | Pre-Acquisition Contingencies Related To TCS Intellectual Property
Accrued Expenses And Other Current Liabilities [Line Items]
Accrued contract costs		3,372,000
TeleCommunication Systems, Inc. | TCS's 911 call handling software
Accrued Expenses And Other Current Liabilities [Line Items]
Accrued warranty obligations	$ 3,999,000	$ 4,650,000
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Accrued Expenses And Other Current Liabilities [Line Items]
Accrued expenses and other current liabilities				(2,079,000)
Contract liabilities, current and non-current				2,079,000
Accrued warranty obligations				(1,679,000)
Other				(400,000)
Warranty obligations | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Accrued Expenses And Other Current Liabilities [Line Items]
Contract liabilities				1,679,000
Other obligations | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Accrued Expenses And Other Current Liabilities [Line Items]
Contract liabilities				$ 400,000
Other Current Liabilities
Accrued Expenses And Other Current Liabilities [Line Items]
Remaining estimated facility exit costs	568,000
Full and Final Warranty Settlement With AT&T | TeleCommunication Systems, Inc. | TCS's 911 call handling software
Accrued Expenses And Other Current Liabilities [Line Items]
Present value of monthly credits	2,029,000
Full and Final Warranty Settlement With AT&T | Accounts Payable and Accrued Liabilities | TeleCommunication Systems, Inc. | TCS's 911 call handling software
Accrued Expenses And Other Current Liabilities [Line Items]
Present value of monthly credits	1,727,000
Full and Final Warranty Settlement With AT&T | Other Noncurrent Liabilities | TeleCommunication Systems, Inc. | TCS's 911 call handling software
Accrued Expenses And Other Current Liabilities [Line Items]
Present value of monthly credits	302,000
Cost of sales | Full and Final Warranty Settlement With AT&T | TeleCommunication Systems, Inc. | TCS's 911 call handling software
Accrued Expenses And Other Current Liabilities [Line Items]
Benefit in connection with favorable settlement	$ 660,000