Acquisition Narrative (Details) - USD ($)		3 Months Ended		9 Months Ended		21 Months Ended
	Feb. 23, 2016	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017
Business Acquisition [Line Items]
Payments for business acquisition, net of cash acquired				$ 0	$ 280,535,000
Repayments of debt assumed in connection with the acquisition	$ 134,101,000			0	134,101,000
Acquisition plan expenses		$ 0	$ 16,960,000	0	20,689,000
Secured Credit Facility
Business Acquisition [Line Items]
Secured credit facility, maximum borrowing capacity	400,000,000
TeleCommunication Systems Inc.
Business Acquisition [Line Items]
Aggregate purchase price	340,432,000
Enterprise value	423,629,000
Payments for business acquisition, net of cash acquired	280,535,000
Cash acquired from the acquisition	$ 59,897,000
Acquisition plan expenses		0		0		$ 21,276,000
Net sales from the acquisition		$ 66,693,000	$ 65,957,000	$ 220,578,000	$ 65,957,000