Acquisition-Related Restructuring Plan - Narrative (Details) - USD ($)	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Aug. 01, 2019
Restructuring Cost and Reserve [Line Items]
Facility exit costs		$ 1,373,000
Estimated facility exit costs			$ 568,000
Estimated contract settlement costs	$ 230,000	0
Government Solutions Segment | Operating Segments
Restructuring Cost and Reserve [Line Items]
Facility exit costs		1,373,000
Estimated contract settlement costs	0
Commercial Solutions Segment | Operating Segments
Restructuring Cost and Reserve [Line Items]
Facility exit costs		$ 0
Estimated contract settlement costs	$ 230,000