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Accounts Receivable | 9 Months Ended
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Apr. 30, 2026
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable Accounts receivable consist of the following at:
|  | April 30, 2026 |  | July 31, 2025
Receivables from commercial and international customers |  | $ | 57,775,000 |  |  | 57,713,000 |
Unbilled receivables from commercial and international customers |  | 54,368,000 |  |  | 69,987,000 |
Receivables from the U.S. government and its agencies |  | 9,418,000 |  |  | 15,610,000 |
Unbilled receivables from the U.S. government and its agencies |  | 24,325,000 |  |  | 20,683,000 |
Total accounts receivable |  | 145,886,000 |  |  | 163,993,000 |
Less allowance for doubtful accounts |  | 18,091,000 |  |  | 19,156,000 |
Accounts receivable, net |  | $ | 127,795,000 |  |  | 144,837,000 |
Unbilled receivables as of April 30, 2026 relate to contracts-in-progress for which revenue has been recognized, but for which we have not yet earned the right to bill the customer for work performed to-date. Under ASC 606, unbilled receivables constitute contract assets. Excluding unbilled receivables related to the U.S. Marine Corps contract discussed below, management estimates that a substantial portion of the remaining net contract assets not yet billed at April 30, 2026 will be billed and collected within one year. Accounts receivable in the table above excludes $363,000 of long-term unbilled receivables presented within "Other assets, net" in the Condensed Consolidated Balance Sheet as of April 30, 2026. As of April 30, 2026, the U.S. government (and its agencies) and a large multinational telecommunications company represented 26.4% and 10.0% of net accounts receivable, respectively. There were no other customers which accounted for 10% or more of net accounts receivable. As of July 31, 2025, the U.S. government (and its agencies) and two domestic top tier mobile network operators represented 25.1%, 14.5% and 10.5% of net accounts receivable, respectively. There were no other customers which accounted for 10% or more of net accounts receivable. In December 2024 (fiscal 2025), we received notice from our prime contractor to stop work associated with a legacy U.S. Marine Corps contract, which has since been terminated for convenience and for which we have submitted a termination claim. Total receivables related to such contract were $10,543,000 as of April 30, 2026. While we believe that we have meritorious termination claims, some or all of our receivable could be at risk of not being collected. Future results of operations related to our troposcatter solutions product line depend, in part, on the nature, timing and amount associated with resolving this matter.

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- Definition The entire disclosure for claims held for amounts due to entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/310-10/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
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