Employee Benefit Plans Reconcilation of Benefit Obligations, Plan Assets and Funded Status (Details) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at end of year	$ 397,430,000	$ 331,181,000
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at beginning of year	631,538,000	548,641,000
Service cost	19,127,000	18,058,000	14,105,000
Interest cost	27,005,000	26,796,000	25,321,000
Participants' contributions	0	0
MMA retiree drug subsidy	0	0
Actuarial Gain (Loss)	(40,130,000)	59,910,000
Benefits Paid	(19,794,000)	(18,770,000)
Translation	(1,876,000)	(3,097,000)
Benefit Obligation at end of year	615,870,000	631,538,000	548,641,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at beginning of the year	331,181,000	266,734,000
Actual Return on Plan Assets	53,276,000	46,174,000
Employer Contribution	32,767,000	37,043,000
Participants' contributions	0	0
MMA retiree drug subsidy	0	0
Benefits Paid	(19,794,000)	(18,770,000)
Fair Value of Plan Assets at end of year	397,430,000	331,181,000	266,734,000
Funded Status	(218,440,000)	(300,357,000)
Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at beginning of year	65,723,000	61,835,000
Service cost	2,791,000	2,382,000	2,198,000
Interest cost	2,762,000	2,839,000	3,101,000
Participants' contributions	1,638,000	1,632,000
MMA retiree drug subsidy	97,000	131,000
Actuarial Gain (Loss)	(15,131,000)	442,000
Benefits Paid	(3,157,000)	(3,538,000)
Translation	0	0
Benefit Obligation at end of year	54,723,000	65,723,000	61,835,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at beginning of the year	0	0
Actual Return on Plan Assets	0	0
Employer Contribution	1,422,000	1,775,000
Participants' contributions	1,638,000	1,632,000
MMA retiree drug subsidy	97,000	131,000
Benefits Paid	(3,157,000)	(3,538,000)
Fair Value of Plan Assets at end of year	0	0	0
Funded Status	$ (54,723,000)	$ (65,723,000)