Goodwill and Intangible Assets - Goodwill and Intangible Assets (Parenthetical) (Detail)	12 Months Ended
Jan. 31, 2015
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization period	1 year

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration