Accrued Expenses and Other Current Liabilities - Product Warranty Rollforward (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jan. 31, 2017	Jan. 31, 2017	Jan. 31, 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		3,234,000	2,096,000
Adjustment to TCS pre-acquisition contingent liability		4,200,000	0
Charges incurred		(3,782,000)	(2,110,000)
Accrued warranty obligations, as of the end of the period	$ 19,014,000	19,014,000	$ 8,624,000
TCS's 911 call handling software [Member] | TeleCommunication Systems Inc.
Changes in Product Warranty Liability
Adjustment to TCS pre-acquisition contingent liability	4,200,000
Accrued warranty obligations, as of the end of the period	$ 10,595,000	$ 10,595,000