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Consolidated Statements of Income and Comprehensive Income Parenthetical (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Consolidated Statements of Income [Abstract]
Income taxes on postretirement benefits	$ 20	$ 7	$ 41	$ 22

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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