Accrued Expenses and Other Current Liabilities - Product Warranty Rollforward (Details) - USD ($)	9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Business Acquisition [Line Items]
Minimum coverage period of product warranty from the date of shipment	1 year
Changes in Product Warranty Liability
Accrued warranty obligations, as of the beginning of the period	$ 15,362,000	$ 8,638,000
Provision for warranty obligations	4,147,000	3,183,000
Adjustment to TCS pre-acquisition contingent liability	4,200,000	154,000
Charges incurred	(5,486,000)	(3,336,000)
Accrued warranty obligations, as of the end of the period	18,223,000	$ 8,639,000
TCS's 911 call handling software | TeleCommunication Systems Inc.
Changes in Product Warranty Liability
Accrued warranty obligations, as of the end of the period	$ 10,216,000