Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Investments And Fair Value Measurements (Assets Measured At Fair Value Using Significant Unobservable Inputs) (Details) (USD $) In Thousands, unless otherwise specified		6 Months Ended
	Jul. 31, 2011	Jan. 31, 2012 Level 3 [Member]	Jan. 31, 2012 Level 1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balances at August 1, 2011		$ 2,042
Net change in other comprehensive income		(23)
Net loss included in earnings
Purchases
Sales/Maturities		(400)
Balances at January 31, 2012		1,619
Other investments securities	$ 8,715		$ 8,777