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Accounts Receivable | 12 Months Ended
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Jul. 31, 2021
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable Accounts receivable consist of the following at July 31, 2021 and 2020:
|  | 2021 |  | 2020
Receivables from commercial and international customers |  | $ | 86,890,000 |  |  | 67,109,000 |
Unbilled receivables from commercial and international customers |  | 36,131,000 |  |  | 21,588,000 |
Receivables from the U.S. government and its agencies |  | 33,381,000 |  |  | 32,870,000 |
Unbilled receivables from the U.S. government and its agencies |  | 3,356,000 |  |  | 7,018,000 |
Total accounts receivable |  | 159,758,000 |  |  | 128,585,000 |
Less allowance for doubtful accounts |  | 1,648,000 |  |  | 1,769,000 |
Accounts receivable, net |  | $ | 158,110,000 |  |  | 126,816,000 |
Unbilled receivables as of July 31, 2021 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 July 31, 2021 will be billed and collected within one year. As of July 31, 2021, 23.0%, 12.7% and 12.1% of total accounts receivable related to U.S. government and its agencies, AT&T, Inc. and Verizon Communications Inc., respectively. Except for the U.S. government and its agencies, which represented 31.0%, respectively, no other customers accounted for greater than 10.0% of total accounts receivable as of July 31, 2020.

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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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