OTHER CURRENT AND NONCURRENT ASSETS: (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Other current assets
Prepaid expenses	$ 31,391us-gaap_PrepaidExpenseCurrent	$ 40,339us-gaap_PrepaidExpenseCurrent
Assets of non-qualified retirement plan	14,174us-gaap_DeferredCompensationPlanAssets	13,900us-gaap_DeferredCompensationPlanAssets
Other miscellaneous assets	117us-gaap_OtherAssetsMiscellaneousCurrent	245us-gaap_OtherAssetsMiscellaneousCurrent
Other current assets	45,682us-gaap_OtherAssetsCurrent	54,484us-gaap_OtherAssetsCurrent
Other noncurrent assets
Acquired intangible assets, net	55,501	469	697
Deferred data acquisitions costs	2,347	4,502
Deferred expenses	7,939us-gaap_DeferredCosts	16,143us-gaap_DeferredCosts
Other miscellaneous noncurrent assets	3,267	3,551
Noncurrent assets	36,454us-gaap_OtherAssetsNoncurrent	24,477us-gaap_OtherAssetsNoncurrent
Customer/trademark assets, gross (Other assets)
Other noncurrent assets
Acquired intangible assets, net	$ 22,901	$ 281	$ 564

Data acquisitions costs capitalized and classified as a noncurrent asset.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Sum of the carrying amounts of deferred costs that are expected to be recognized as a charge against earnings in periods after one year or beyond the normal operating cycle, if longer.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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