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Accounts Receivable (Tables) | 9 Months Ended
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Apr. 30, 2012
Accounts Receivable [Abstract] |
Accounts receivable |
| ##### April 30, 2012 |  | ##### July 31, 2011
Billed receivables from commercial customers | $ 34,429,000 |  | 38,245,000
Billed receivables from the U.S. government and its agencies | 33,533,000 |  | 22,075,000
Unbilled receivables on contracts-in-progress | 6,187,000 |  | 11,701,000
Total accounts receivable | 74,149,000 |  | 72,021,000
Less allowance for doubtful accounts | 1,140,000 |  | 1,220,000
Accounts receivable, net | $ 73,009,000 |  | 70,801,000

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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