Income Taxes (Schedule Of Significant Components Of The Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Current:
Federal	$ 32,988us-gaap_CurrentFederalTaxExpenseBenefit	$ 42,040us-gaap_CurrentFederalTaxExpenseBenefit	$ 25,230us-gaap_CurrentFederalTaxExpenseBenefit
State	1,626	2,799	2,622
Foreign	29,733us-gaap_CurrentForeignTaxExpenseBenefit	33,022us-gaap_CurrentForeignTaxExpenseBenefit	41,333us-gaap_CurrentForeignTaxExpenseBenefit
Total current	64,347us-gaap_CurrentIncomeTaxExpenseBenefit	77,861us-gaap_CurrentIncomeTaxExpenseBenefit	69,185us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	6,391	(785)	11,329
State	281	(79)	1,103
Foreign	(7,007)	(52,620)	(35,191)
Total deferred	(335)us-gaap_DeferredIncomeTaxExpenseBenefit	(53,484)us-gaap_DeferredIncomeTaxExpenseBenefit	(22,759)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes	$ 64,012us-gaap_IncomeTaxExpenseBenefit	$ 24,377us-gaap_IncomeTaxExpenseBenefit	$ 46,426us-gaap_IncomeTaxExpenseBenefit

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