Summary of Significant Accounting and Reporting Policies (Revenue Recognition, Narrative) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 549,994,000	$ 486,239,000	$ 581,695,000
Revenue recognized, included in contract liabilities in prior period	53,079,000	51,762,000
International
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 132,117,000	$ 121,392,000	$ 138,943,000
Customer Concentration Risk | Net sales | Verizon Communications Inc.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage	10.60%	11.10%	10.70%
Geographic Concentration Risk | Net sales
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
Geographic Concentration Risk | Net sales | International
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage	24.00%	25.00%	23.90%
Net sales	$ 132,117,000	$ 121,392,000	$ 138,943,000