Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions	6 Months Ended
	Jan. 31, 2018
Customer Relationships [Member]
Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions [Line Items]
Weighted average remaining useful life	3 years
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	2 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] | Customer Relationships [Member]
Goodwill and intangible assets (Details) - Schedule of useful lives for acquisitions [Line Items]
Useful life assigned	15 years