Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions	12 Months Ended
	Jul. 31, 2016
Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions [Line Items]
Useful life assigned	10 years
Customer Relationships [Member]
Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions [Line Items]
Weighted average remaining useful life	4 years
Trademarks [Member]
Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions [Line Items]
Useful life assigned	5 years
Weighted average remaining useful life	1 year
Other Intangible Assets [Member]
Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions [Line Items]
Useful life assigned	10 years
Weighted average remaining useful life	3 years
Minimum [Member]
Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions [Line Items]
Useful life assigned	4 years
Minimum [Member] | Customer Relationships [Member]
Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions [Line Items]
Useful life assigned	8 years
Maximum [Member]
Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions [Line Items]
Useful life assigned	15 years
Maximum [Member] | Customer Relationships [Member]
Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions [Line Items]
Useful life assigned	15 years