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Intangible Assets (Details) (USD $)
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3 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Apr. 30, 2011
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Apr. 30, 2010
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Apr. 30, 2011
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Apr. 30, 2010
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Jul. 31, 2010
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Apr. 30, 2011
Technologies [Member]
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Jul. 31, 2010
Technologies [Member]
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Apr. 30, 2011
Customer relationships [Member]
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Jul. 31, 2010
Customer relationships [Member]
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Apr. 30, 2011
Trademarks and other [Member]
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Jul. 31, 2010
Trademarks and other [Member]
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| Weighted Average Amortization Period | Â | Â | Â | Â | Â | 10.0 | 10.6 | 10.0 | 9.9 | 17.5 | 17.6 |
| Gross Carrying Amount | $ 83,669,000 | Â | $ 83,669,000 | Â | $ 78,199,000 | $ 47,694,000 | $ 42,224,000 | $ 29,931,000 | $ 29,931,000 | $ 6,044,000 | $ 6,044,000 |
| Accumulated Amortization | 36,172,000 | Â | 36,172,000 | Â | 30,108,000 | 25,883,000 | 22,531,000 | 8,524,000 | 6,223,000 | 1,765,000 | 1,354,000 |
| Net Carrying Amount | 47,497,000 | Â | 47,497,000 | Â | 48,091,000 | 21,811,000 | 19,693,000 | 21,407,000 | 23,708,000 | 4,279,000 | 4,690,000 |
| Total business acquisition purchase price | 5,303,000 | Â | 5,303,000 | Â | Â | Â | Â | Â | Â | Â | Â |
| Fair value of contingent consideration arrangement | 3,803,000 | Â | 3,803,000 | Â | Â | Â | Â | Â | Â | Â | Â |
| Term, in years, of contingent consideration arrangement | Â | Â | 3 | Â | Â | Â | Â | Â | Â | Â | Â |
| Business acquisition purchase price paid | Â | Â | 1,500,000 | Â | Â | Â | Â | Â | Â | Â | Â |
| Payment of contingent consideration related to business acquisition | Â | Â | 8,000 | 0 | Â | Â | Â | Â | Â | Â | Â |
| Business acquisition, contingent consideration at fair value, noncurrent | 3,574,000 | Â | 3,574,000 | Â | Â | Â | Â | Â | Â | Â | Â |
| Business acquisition, contingent consideration at fair value, current | 492,000 | Â | 492,000 | Â | Â | Â | Â | Â | Â | Â | Â |
| Business acquisition, contingent consideration at fair value, accretion expense | 118,000 | Â | 271,000 | Â | Â | Â | Â | Â | Â | Â | Â |
| Useful life, in years | Â | Â | 5 | Â | Â | Â | Â | Â | Â | Â | Â |
| Amortization Expense | 2,173,000 | 1,754,000 | 6,064,000 | 5,283,000 | Â | Â | Â | Â | Â | Â | Â |
| Amortization Expense - Current Fiscal Year | Â | Â | 8,091,000 | Â | Â | Â | Â | Â | Â | Â | Â |
| Amortization Expense - Year Two | Â | Â | 6,637,000 | Â | Â | Â | Â | Â | Â | Â | Â |
| Amortization Expense - Year Three | Â | Â | 6,327,000 | Â | Â | Â | Â | Â | Â | Â | Â |
| Amortization Expense - Year Four | Â | Â | 6,285,000 | Â | Â | Â | Â | Â | Â | Â | Â |
| Amortization Expense - Year Five | Â | Â | $ 6,211,000 | Â | Â | Â | Â | Â | Â | Â | Â |