Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Income Tax Contingency [Line Items]
Reversal of valuation allowance			$ 41,000,000	$ 16,000,000	$ 27,600,000
Foreign net operating loss carryforwards	617,900,000	606,800,000	617,900,000	606,800,000
Long-term deferred income tax liability	95,215,000	99,083,000	95,215,000	99,083,000
Cumulative undistributed earnings of foreign subsidiaries	390,200,000		390,200,000
Unrecognized tax benefits that, if recognized, would impact the effective tax rate	5,400,000	4,800,000	5,400,000	4,800,000	2,500,000
Unrecognized tax benefits that have a reasonable possibility of significantly decreasing within the 12 months	1,400,000		1,400,000
Europe
Income Tax Contingency [Line Items]
Reversal of valuation allowance	(45,300,000)	(25,100,000)	45,300,000	25,100,000	13,600,000
SDG
Income Tax Contingency [Line Items]
Long-term deferred income tax liability		30,100,000		30,100,000
Short term deferred tax asset		$ 3,100,000		$ 3,100,000