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Deferred Compensation And Retirement Plans (Details) (USD $)	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Deferred Compensation And Retirement Plans
Service cost		$ 34,000
Interest cost	884,000	925,000
Amortization of actuarial loss	355,000	105,000
Net periodic benefit costs	1,239,000	1,064,000
Company contributions to the ECAP	12,300,000	300,000
Change in Fair Value of Vested Amounts owed under deferred compensation plan, (Income), Expense	$ (1,300,000)	$ (1,200,000)
Deferred compensation arrangement vesting terms	Participants generally vest in Company contributions over a four year period.

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

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- Definition

The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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- Definition

The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

+ References

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-Name Accounting Standards Codification
-Glossary Gain or Loss
-URI http://asc.fasb.org/extlink&oid=6514294
-Topic 715
-SubTopic 30

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

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