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Benefit Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Apr. 30, 2013 employee	Apr. 30, 2012	Apr. 30, 2011
Benefits Plans
401(k) expense	$ 4,949	$ 3,681	$ 3,049
Common stock held for future issuance	1,496,465
Executive officers participants in SERP	2
Annual retirement benefit maximum percentage of base compensation for executives until death	50.00%
Deferred compensation accrued	6,457	6,611
Defined benefit plan discount rate	4.00%	4.60%
Expected retirement benefit expense for the next five years	625
Retirement benefit expense	$ 471	$ 662

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Annual Benefit Maximum Unitl Death Percentage

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Executive Officers Participants In S E R P

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- Definition

Aggregate number of common shares reserved for future issuance.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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The interest rate used to adjust for the time value of money for the plan.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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