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Information Concerning Supplemental Disclosures of Cash Flow Activities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Cash paid, net for:
Interest	$ 5,400	$ 8,538
Income taxes	$ 2,723	$ 2,353

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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