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Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Commitments And Contingencies [Line Items]
Total rental expenses	$ 7,378,000	$ 7,206,000	$ 7,518,000
Significant Shareholders [Member]
Commitments And Contingencies [Line Items]
Total rental expenses	461,000	460,000	460,000
Rent Agreement Term	5 years
Rent expense from remaining term	$ 1,397,000
Unpaid rent annual interest increase	2.00%

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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