Employee Retirement Benefits Accumulated Other Comprehensive Income (Details) (Other Postretirement Benefit Plans, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss	$ 3,441	$ 3,218	$ 1,912
Transition obligation	0	23	45
Pre-tax accumulated other comprehensive loss	3,441	3,241	1,957
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Pre-tax accumulated other comprehensive loss	3,241	1,957	1,935
Recognized net (loss)	(210)	(104)	(144)
Amortization of transition obligation	(23)	(23)	(23)
Net actuarial loss	433	1,411	189
Pre-tax accumulated other comprehensive loss	$ 3,441	$ 3,241	$ 1,957