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Goodwill and intangible assets (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jan. 31, 2015
Jul. 31, 2014
Goodwill and intangible assets (Details) [Line Items]    
Goodwill 7,452us-gaap_Goodwill $ 7,452us-gaap_Goodwill
Intangible Assets, Amortization Period [Member]    
Goodwill and intangible assets (Details) [Line Items]    
Finite-Lived Intangible Asset, Useful Life 4 years 6 months