Accounting Policies Accounting Policies (Details 3) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 72,126,000	$ 66,744,000	$ 250,100,000	$ 180,988,000
Equity in earnings	(46,474,000)	(4,189,000)	(59,815,000)	(24,627,000)
Income tax benefit	100,644,000	(20,025,000)	68,522,000	(19,888,000)
Reclassification out of accumulated OCI [Member] | Accumulated net gain (loss) from designated or qualifying cash flow hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense			5,721,000
Equity in earnings			72,000
Total before income tax and noncontrolling interest			5,793,000
Income tax benefit			(2,247,000)
Noncontrolling interest			(13,000)
Loss reclassified from accumulated OCI			$ 3,533,000