Commitments and Contingencies - Additional Information (Detail) - USD ($)	Oct. 31, 2015	Jan. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Indemnity obligation liability	$ 0	$ 0

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

No definition available.

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