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Accounts Receivable | 6 Months Ended
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Jan. 31, 2022
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable Accounts receivable consist of the following at:
|  | January 31, 2022 |  | July 31, 2021
Receivables from commercial and international customers |  | $ | 75,095,000 |  |  | 86,890,000 |
Unbilled receivables from commercial and international customers |  | 34,803,000 |  |  | 36,131,000 |
Receivables from the U.S. government and its agencies |  | 29,079,000 |  |  | 33,381,000 |
Unbilled receivables from the U.S. government and its agencies |  | 1,425,000 |  |  | 3,356,000 |
Total accounts receivable |  | 140,402,000 |  |  | 159,758,000 |
Less allowance for doubtful accounts |  | 1,635,000 |  |  | 1,648,000 |
Accounts receivable, net |  | $ | 138,767,000 |  |  | 158,110,000 |
Unbilled receivables as of January 31, 2022 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. Management estimates that a substantial portion of the amounts not yet billed at January 31, 2022 will be billed and collected within one year. As of January 31, 2022, 21.7%, 15.2% and 14.7% of total accounts receivable related to the U.S. government (and its agencies), AT&T, Inc. and Verizon, respectively. As of July 31, 2021, 23.0%, 12.7% and 12.1% of total accounts receivable related to the U.S. government and its agencies, AT&T, Inc. and Verizon, respectively.

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- Definition The entire disclosure for claims held for amounts due a 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 -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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