Assets and liabilities measured at fair value on a recurring basis (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2014
Holdback Payment and Earn-Out Payments	$ 934
Total assets at fair value	934
Quoted prices in active markets (Level 1)
Holdback Payment and Earn-Out Payments	0
Total assets at fair value	0
Significant other observable inputs (Level 2)
Holdback Payment and Earn-Out Payments	0
Total assets at fair value	0
Significant unobservable inputs (Level 3)
Holdback Payment and Earn-Out Payments	934
Total assets at fair value	$ 934