Derivative Financial Instruments (Details Textual) (CHF) In Millions, unless otherwise specified	12 Months Ended
Jan. 31, 2015
Foreign Exchange Forward
Derivatives Fair Value [Line Items]
Net forward contracts hedging portfolio	38
Maximum
Derivatives Fair Value [Line Items]
Expiry dates ranging	Jul. 15, 2015

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant