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Retirement plans Weighted-average assumptions used to determine net cost and benefit obligations (Details)	12 Months Ended
	Jan. 31, 2013 Rate	Jan. 31, 2012 Rate
Weighted-average assumptions used to determine net cost and benefit obligations [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.00%	4.25%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.00%	8.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.25%	5.78%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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