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Summary of Significant Accounting and Reporting Policies (Revenue Recognition, Narrative) (Details) - USD ($)	3 Months Ended												12 Months Ended
	Jul. 31, 2021	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 145,809,000	$ 139,376,000	$ 161,292,000	$ 135,218,000	$ 149,673,000	$ 135,121,000	$ 161,654,000	$ 170,267,000	$ 176,372,000	$ 170,448,000	$ 164,133,000	$ 160,844,000	$ 581,695,000	$ 616,715,000	$ 671,797,000
Revenue recognized, included in contract liabilities in prior period														34,545,000	34,225,000
Contract liabilities, increase from business combinations													648,000	6,890,000
International
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales													$ 138,943,000	$ 145,107,000	$ 170,607,000
Customer Concentration Risk | Net sales | Verizon Communications Inc.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage													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													23.90%	23.50%	25.40%
Net sales													$ 138,942,000	$ 145,107,000	$ 170,607,000

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