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Commitments and Contingencies - Purchase Commitments (Details)
$ in Thousands
Apr. 30, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Conditional purchase commitment $ 500
Purchase Obligation, Fiscal Year Maturity  
2014 1,212
2015 295
2016 100
2017 0
2018 0
Thereafter 0
Total $ 1,607