INCOME TAXES INCOME TAXES - DEFERRED INCOME TAXES (Details) (USD $)	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014
Income Tax Disclosure [Abstract]
Deferred Tax Liability Not Recognized Undistributed Foreign Earnings	$ 398,700,000
Components of Deferred Tax Assets [Abstract]
Accrued expenses	5,876,000	6,800,000
Deferred revenue	10,058,000us-gaap_DeferredTaxAssetsDeferredIncome	12,387,000us-gaap_DeferredTaxAssetsDeferredIncome
Loss carryforwards	153,351,000	137,565,000
Tax credits	9,290,000	8,795,000
Stock-based and other compensation	16,609,000	15,060,000
Capitalized research and development expenses	4,883,000	3,914,000
Other, net	1,745,000us-gaap_DeferredTaxAssetsOther	910,000us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	201,812,000us-gaap_DeferredTaxAssetsGross	185,431,000us-gaap_DeferredTaxAssetsGross
Valuation allowance	(131,909,000)	(146,860,000)
Components of Deferred Tax Liabilities [Abstract]
Goodwill and other intangible assets	(62,815,000)	(32,134,000)
Unremitted earnings of foreign subsidiaries	(15,817,000)	0
Other, net	(2,089,000)us-gaap_DeferredTaxLiabilitiesOther	(1,484,000)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	80,721,000us-gaap_DeferredTaxLiabilities	33,618,000us-gaap_DeferredTaxLiabilities
Deferred Tax Assets (Liabilities), Net [Abstract]
Net deferred tax (liabilities) assets	(10,818,000)us-gaap_DeferredTaxAssetsLiabilitiesNet	4,953,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Current deferred tax assets	11,176,000us-gaap_DeferredTaxAssetsNetCurrent	9,002,000us-gaap_DeferredTaxAssetsNetCurrent
Long-term deferred tax assets	10,778,000us-gaap_DeferredTaxAssetsNetNoncurrent	9,783,000us-gaap_DeferredTaxAssetsNetNoncurrent
Current deferred tax liabilities	(2,108,000)us-gaap_DeferredTaxLiabilitiesCurrent	(474,000)us-gaap_DeferredTaxLiabilitiesCurrent
Long-term deferred tax liabilities	$ (30,664,000)	$ (13,358,000)

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves and accruals not separately disclosed.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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