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Customer and Geographic Information (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 | Jan. 31, 2013
Major customer |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 13.50% |  | 13.00% |
Minimum percentage of consolidated net sales sold to one customer or individual country requiring additional and separate disclosure | 10.00% | 10.00% | 10.00% | 10.00%
U.S. government |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 31.20% | 32.80% | 28.40% | 38.60%
U.S. government | Excluding Mobile Data Communications segment |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 25.70% | 25.80% | 23.20% | 31.50%
Commercial (United States) |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 11.30% | 12.90% | 14.30% | 13.30%
Total United States |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 42.50% | 45.70% | 42.70% | 51.90%
North African country |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 13.70% | 8.20% | 13.10% | 5.00%
Other international |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 43.80% | 46.10% | 44.20% | 43.10%
Total International |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 57.50% | 54.30% | 57.30% | 48.10%
Revenue generated from external customers | $ 49,144,000 | $ 40,471,000 | $ 96,684,000 | $ 79,689,000

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- Definition The minimum percentage of consolidated net sales that, if made to one customer or country, would require additional and separate disclosure. + References No definition available. + Details
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- Definition Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 38 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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