Acquisition-Related Restructuring Plan - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Aug. 01, 2019
Restructuring Cost and Reserve [Line Items]
Facility exit costs				$ 1,373,000
Estimated facility exit costs					$ 568,000
Write-off of deferred financing costs	$ (262,000)	$ 3,886,000	$ (32,000)	3,886,000
Government Solutions Segment | Operating Segments
Restructuring Cost and Reserve [Line Items]
Facility exit costs				1,373,000
Write-off of deferred financing costs	0	0	0	0
Commercial Solutions Segment | Operating Segments
Restructuring Cost and Reserve [Line Items]
Facility exit costs				0
Write-off of deferred financing costs	$ (262,000)	$ 3,886,000	$ (32,000)	$ 3,886,000