Debt and Lines of Credit (Details) In Millions, unless otherwise specified	6 Months Ended						6 Months Ended		6 Months Ended
	Jul. 31, 2012 USD ($)	Jul. 31, 2012 CHF	Jul. 31, 2011 USD ($)	Jul. 31, 2011 CHF	Jul. 31, 2012 First amendment [Member]	Jul. 31, 2012 Second amendment [Member]	Jul. 31, 2012 Loan Agreement [Member] USD ($)	Mar. 12, 2012 Loan Agreement [Member] USD ($)	Jul. 31, 2012 Maximum [Member] USD ($)	Jul. 31, 2012 Minimum [Member] USD ($)	Jul. 31, 2012 Revolving credit facility [Member] USD ($)	Mar. 12, 2012 Revolving credit facility [Member] USD ($)	Jul. 31, 2012 LIBOR [Member]	Jul. 31, 2012 Lines of credit [Member] USD ($)	Jul. 31, 2011 Lines of credit [Member] USD ($)	Jul. 31, 2012 Base rate loans [Member]
Debt and Lines of Credit (Textual) [Abstract]
Asset based senior revolving credit facility	$ 25.0											$ 25.0
Letter of credit sub facility								15.0
Maximum credit facility											50
Fixed charge coverage ratio maximum							1.25				1.25
Fixed charge coverage ratio minimum							1				1.0
Lenders' commitment under the Loan Agreement									55.0	25.0
Applicable margin for LIBOR rate loans					1.25%	0.75%							4.25%
Decreased or increased in applicable margin rates									12.5	5.0
Applicable margins based on current availability for LIBOR rate loans at the end													2.00%			1.00%
Share repurchases made by the Borrowers									150.0
Borrowing against unsecured lines of credit	0													0	0
Availability under loan agreement							12.5		10.0	10.0
Acquisition made by the borrowers									50.0
Debt and Lines of Credit (Additional Textual) [Abstract]
Credit facility maturity	Mar. 12, 2015
Amount blocked for specific purpose	10.0
Domestic EBITDA	10.0
Current borrowing base	25.0											25.0
Maximum reduction in availability block	5.0
Letters of credit outstanding under sub facility	20.7
Outstanding borrowing amount in letters of credit facility	0													0	0
Application margin for base rate loan	3.25%
Decreased or increased in applicable margin	0.25%
Time limit for imposing fixed charge	90 days
Time limit for imposing cash dominion	45 days
Aggregate amount of charitable donations permitted by the Company	14
Cash assets with the borrowers	60.0
Positive EBITDA	0
Lines of credit totalled at the end	10.2	10.0	12.7	10.0
Guaranteed obligations to third parties	2.1
Specified borrowing capacity	$ 12.5
Time period for imposing minimum fixed charge coverage ratio	90 days