Quarterly report pursuant to Section 13 or 15(d)

Goodwill and intangible assets (Detail) - Schedule of useful lives for acquisitions

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