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Revenue Recognition (Sales by Geography and Customer Type (Details) - Net sales	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk | U.S. government
Concentration Risk [Line Items]
Concentration risk, percentage	27.10%	44.20%	28.60%	38.80%
Geographic Concentration Risk | Domestic
Concentration Risk [Line Items]
Concentration risk, percentage	47.60%	33.90%	48.00%	37.60%
Geographic Concentration Risk | Total United States
Concentration Risk [Line Items]
Concentration risk, percentage	74.70%	78.10%	76.60%	76.40%
Geographic Concentration Risk | International
Concentration Risk [Line Items]
Concentration risk, percentage	25.30%	21.90%	23.40%	23.60%
Customer Concentration Risk | Verizon Communications Inc.
Concentration Risk [Line Items]
Concentration risk, percentage	11.10%	10.00%	11.40%	11.10%

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