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Accounts Receivable (Tables) | 6 Months Ended
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Jan. 31, 2017
Accounts Receivable Additional Disclosures [Abstract] |
Accounts receivable | Accounts receivable consist of the following at:
|  | January 31, 2017 |  | July 31, 2016
Billed receivables from commercial and international customers |  | $ | 73,002,000 |  |  | 90,185,000 |
Unbilled receivables from commercial and international customers |  | 23,405,000 |  |  | 19,333,000 |
Billed receivables from the U.S. government and its agencies |  | 16,958,000 |  |  | 21,465,000 |
Unbilled receivables from the U.S. government and its agencies |  | 13,642,000 |  |  | 21,013,000 |
Total accounts receivable |  | 127,007,000 |  |  | 151,996,000 |
Less allowance for doubtful accounts |  | 1,462,000 |  |  | 1,029,000 |
Accounts receivable, net |  | $ | 125,545,000 |  |  | 150,967,000 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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