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Goodwill and intangible assets (Detail) - Schedule of useful lives for acquisitions
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3 Months Ended |
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Oct. 31, 2012
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Minimum [Member] | Customer Relationships [Member]
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| Useful life assigned | 8 years |
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Minimum [Member] | Other Intangible Assets [Member]
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| Useful life assigned | 4 years |
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Maximum [Member] | Customer Relationships [Member]
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| Useful life assigned | 15 years |
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Maximum [Member] | Other Intangible Assets [Member]
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| Useful life assigned | 10 years |
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Weighted Average [Member] | Customer Relationships [Member]
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| Useful life assigned | 8 years |
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Weighted Average [Member] | Trademarks [Member]
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| Useful life assigned | 4 years 6 months |
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Weighted Average [Member] | Other Intangible Assets [Member]
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| Useful life assigned | 2 years |
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Trademarks [Member]
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| Useful life assigned | 5 years |