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Intangible Assets (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 21 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2012 | Apr. 30, 2011 | Jul. 31, 2011 | Apr. 30, 2012 Technologies [Member] | Jul. 31, 2011 Technologies [Member] | Apr. 30, 2012 Customer relationships [Member] | Jul. 31, 2011 Customer relationships [Member] | Apr. 30, 2012 Trademarks and other [Member] | Jul. 31, 2011 Trademarks and other [Member] | Apr. 30, 2012 Acquisition of Stampede Technologies, Inc. [Member] | Apr. 30, 2011 Acquisition of Stampede Technologies, Inc. [Member] | Apr. 30, 2012 Acquisition of Stampede Technologies, Inc. [Member] | Apr. 30, 2011 Acquisition of Stampede Technologies, Inc. [Member] | Apr. 30, 2012 Acquisition of Stampede Technologies, Inc. [Member] | Oct. 31, 2010 Acquisition of Stampede Technologies, Inc. [Member]
Weighted Average Amortization Period |  |  |  |  |  | 11 years 8 months 12 days | 10 years 2 months 12 days | 10 years | 10 years | 19 years 9 months 18 days | 18 years 7 months 6 days |  |  | 5 years |  |  |
Gross Carrying Amount | $ 83,669,000 |  | $ 83,669,000 |  | $ 83,669,000 | $ 47,694,000 | $ 47,694,000 | $ 29,931,000 | $ 29,931,000 | $ 6,044,000 | $ 6,044,000 |  |  |  |  |  |
Accumulated Amortization | 43,236,000 |  | 43,236,000 |  | 38,199,000 | 29,535,000 | 27,000,000 | 11,494,000 | 9,281,000 | 2,207,000 | 1,918,000 |  |  |  |  |  |
Net Carrying Amount | 40,433,000 |  | 40,433,000 |  | 45,470,000 | 18,159,000 | 20,694,000 | 18,437,000 | 20,650,000 | 3,837,000 | 4,126,000 |  |  |  |  |  |
Effective date of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2010 |  |  |
Name of acquired entity |  |  |  |  |  |  |  |  |  |  |  |  |  | Stampede Technologies, Inc. |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,303,000
Fair value of contingent consideration arrangement |  |  |  |  |  |  |  |  |  |  |  | 3,520,000 |  | 3,520,000 |  | 3,520,000 |
Contingent earn-out period end date |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2013 |  |  |
Business acquisition purchase price paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,687,000 |
Payment of contingent earn-out related to business acquisition |  |  | 163,000 | 8,000 |  |  |  |  |  |  |  |  |  |  |  | 187,000 |
Business acquisition, contingent consideration at fair value, noncurrent |  |  |  |  |  |  |  |  |  |  |  | 2,356,000 |  | 2,356,000 |  | 2,356,000 |
Business acquisition, contingent consideration at fair value, current | 1,164,000 |  | 1,164,000 |  | 726,000 |  |  |  |  |  |  | 1,164,000 |  | 1,164,000 |  | 1,164,000 |
Business acquisition, contingent consideration at fair value, accretion expense |  |  |  |  |  |  |  |  |  |  |  | 116,000 | 118,000 | 357,000 | 271,000 | 748,000 |
Amortization Expense | 1,626,000 | 2,173,000 | 5,037,000 | 6,064,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization Expense - Current Fiscal Year | 6,637,000 |  | 6,637,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization Expense - Year Two | 6,327,000 |  | 6,327,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization Expense - Year Three | 6,285,000 |  | 6,285,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization Expense - Year Four | 6,211,000 |  | 6,211,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization Expense - Year Five | $ 4,962,000 |  | $ 4,962,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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