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Restructuring Charges (Narrative) (Details) (USD $)	3 Months Ended			9 Months Ended			9 Months Ended	12 Months Ended
Restructuring Charges (Narrative) (Details) (USD $)	Jan. 31, 2013	Oct. 31, 2012	Jan. 31, 2012 segment	Jan. 31, 2013	Jan. 31, 2012	Apr. 30, 2012	Jan. 31, 2013 2012 Restructuring Plan [Member] segment	Apr. 30, 2012 2012 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Number of manufacturing plants held for sale			2				2
Pre-tax restructuring charges	$ 118,000		$ 10,347,000	$ 979,000	$ 10,362,000		$ 1,000,000	$ 15,900,000
Reserve for restructuring charges	21,000			21,000		2,817,000	21,000,000
Net book value of plants recoverable	3,000,000			3,000,000
Recognized recurring operating costs for closed facilities				800,000
Recognized gain from sale of plant		$ 300,000

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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- Definition

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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