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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Net income	$ 232,428us-gaap_NetIncomeLoss	$ 282,360us-gaap_NetIncomeLoss	$ 237,314us-gaap_NetIncomeLoss
Other comprehensive (loss) income:
Foreign currency translation	(14,128)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	7,194us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	1,455us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Change in unrealized (losses) gains on marketable securities, net of tax	(331)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	620us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1,275us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Net current-period other comprehensive income/(loss)	(14,459)us-gaap_OtherComprehensiveIncomeLossNetOfTax	7,814us-gaap_OtherComprehensiveIncomeLossNetOfTax	2,730us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	$ 217,969us-gaap_ComprehensiveIncomeNetOfTax	$ 290,174us-gaap_ComprehensiveIncomeNetOfTax	$ 240,044us-gaap_ComprehensiveIncomeNetOfTax

X

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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