Goodwill (Details)	3 Months Ended		8 Months Ended
	Oct. 31, 2019 USD ($) operating_segment	Jul. 31, 2019 USD ($)	Oct. 31, 2019 USD ($)	Aug. 01, 2019 $ / shares	Apr. 29, 2019 USD ($)	Feb. 28, 2019 USD ($)
Goodwill [Line Items]
Goodwill	$ 309,871,000	$ 310,489,000	$ 309,871,000
Number of reportable segments | operating_segment	2
Commercial Solutions Segment
Goodwill [Line Items]
Goodwill	$ 250,678,000	251,296,000	250,678,000
Reporting unit, percentage of fair value in excess of carrying amount				29.00%
Government Solutions Segment
Goodwill [Line Items]
Goodwill	59,193,000	59,193,000	59,193,000
Reporting unit, percentage of fair value in excess of carrying amount				122.20%
Common Stock
Goodwill [Line Items]
Common stock price (in dollars per share) | $ / shares				$ 29.54
Solacom
Goodwill [Line Items]
Goodwill	11,388,000		11,388,000			$ 11,808,000
Goodwill, Purchase Accounting Adjustments	(420,000)		(420,000)
Solacom | Commercial Solutions Segment
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	(420,000)
GD NG-911 business
Goodwill [Line Items]
Goodwill	7,850,000		$ 7,850,000		$ 8,048,000
Goodwill, Purchase Accounting Adjustments	(198,000)	$ (198,000)
GD NG-911 business | Commercial Solutions Segment
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	$ (198,000)