Commitments and Contingencies - Future Payments under Non-cancellable Contractual Purchases (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015
Unconditional Purchase Obligations Excluding Capital Stock Redemptions [Abstract]
Remainder of 2016	$ 14,922
2017	11,244
2018	3,083
Total	$ 29,249us-gaap_ContractualObligation

Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant