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Accrued Expenses and Other Current Liabilities (Accrued Business Acquisition Payments) (Details) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 42 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 Acquisition of Stampede Technologies, Inc. [Member] | Jan. 31, 2013 Acquisition of Stampede Technologies, Inc. [Member] | Jan. 31, 2014 Acquisition of Stampede Technologies, Inc. [Member] | Jan. 31, 2013 Acquisition of Stampede Technologies, Inc. [Member] | Jan. 31, 2014 Acquisition of Stampede Technologies, Inc. [Member] | Oct. 31, 2010 Acquisition of Stampede Technologies, Inc. [Member] | Jan. 31, 2014 Technologies [Member] | Jul. 31, 2013 Technologies [Member] | Jan. 31, 2014 Technologies [Member] Acquisition of Stampede Technologies, Inc. [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective date of acquisition |  |  |  |  |  |  | Oct. 01, 2010 |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  | $ 5,303,000 |  |  |
Business acquisition, contingent consideration, at fair value |  |  |  |  |  |  |  | 3,803,000 |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  | 11 years 9 months 18 days | 11 years 8 months 12 days | 5 years
Benefit related to a change in fair value of contingent earn-out liability | 239,000 | 3,267,000 |  | 889,000 | 239,000 | 3,267,000 |  |  |  |  |
Business acquisition contingent consideration interest accretion expense |  |  | 0 | 25,000 | 0 | 133,000 | 986,000 |  |  |  |
Purchase price paid in cash as of the balance sheet date |  |  | 1,865,000 |  | 1,865,000 |  | 1,865,000 |  |  |  |
Payment of contingent consideration related to business acquisition | $ 49,000 | $ 10,000 | $ 43,000 |  |  |  | $ 365,000 |  |  |  |

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- Definition Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(3),(c)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph g(1) -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph f -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 29, 30, 41, 42, 64 -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 65 -Subparagraph a, b -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. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6910684&loc=d3e4570-128470 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 30 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=18499824&loc=d3e4237-128469 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 30 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=18499824&loc=d3e4243-128469 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 40 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6910732&loc=d3e4805-128471 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 25 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6946367&loc=d3e3642-128468 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 25 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=6946367&loc=d3e3629-128468 + Details
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