Derivative Financial Instruments (Details Textual) (CHF) In Millions, unless otherwise specified	6 Months Ended
Jul. 31, 2014
Derivative Financial Instruments (Textual) [Abstract]
Expiry dates ranging	Jan. 20, 2015
Foreign Exchange Forward
Derivative Financial Instruments (Textual) [Abstract]
Net forward contracts hedging portfolio	41.0

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