Employee Benefit And Retirement Plans (Schedule Of Assumptions Used To Determine Benenfit Obligations And Earnings Effects For Pension Plans) (Details)	12 Months Ended
	Apr. 30, 2014		Apr. 30, 2013		Apr. 30, 2012		Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.56%		4.21%
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.21%		4.66%		4.76%	[1]	5.66%	[1]
Expected return on plan assets	7.50%		7.50%		8.00%
Rate of compensation increase		[2]		[2]	4.00%

[1] The discount rate was 5.66% from May 1, 2011 to December 31, 2011 and 4.76% from January 1, 2012 to April 30, 2012. The rate changed during fiscal 2012 as a result of the required re-measurement of the Company's pension liability upon its decision to freeze its pension plans.

[2] The rate of compensation increase is not applicable for periods beyond April 30, 2012 because the Company froze its pension plans effective as of that date.