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Restructuring Charges (Narrative) (Details) (USD $)	3 Months Ended			3 Months Ended	12 Months Ended
Restructuring Charges (Narrative) (Details) (USD $)	Jul. 31, 2012	Jul. 31, 2011	Apr. 30, 2012	Jul. 31, 2012 2012 Restructuring Plan [Member]	Apr. 30, 2012 2012 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring charges	$ 777,000	$ 15,000		$ 800,000	$ 15,900,000
Reserve for restructuring charges	686,000		2,817,000	700,000
Net book value of plants recoverable			7,300,000
Recognized recurring operating costs for closed facilities	$ 400,000

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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