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Revenue Recognition (Sales by Geography and Customer Type) (Details) - Net sales | 3 Months Ended
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Oct. 31, 2022 | Oct. 31, 2021
Geographic Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
Geographic Concentration Risk | U.S. government |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 32.10% | 30.10%
Geographic Concentration Risk | Domestic |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 46.70% | 48.50%
Geographic Concentration Risk | Total United States |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 78.80% | 78.60%
Geographic Concentration Risk | International |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 21.20% | 21.40%
Customer Concentration Risk | Verizon Communications Inc. |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 12.50% | 11.70%

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