Summary Of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Apr. 30, 2013 item	Apr. 30, 2012	Apr. 30, 2011
Advertising costs	$ 36,500,000	$ 37,400,000	$ 30,000,000
Cash equivalents	38,900,000	31,800,000
Impairment of long-lived assets	0	0	0
Number of non-contributory defined benefit pension plans	2
Promotional Display [Member]
Amortization	$ 4,000,000	$ 5,600,000	$ 7,900,000
Maximum [Member] | Building And Building Improvements [Member]
Property, Plant and Equipment, Useful Life	30 years
Maximum [Member] | Machinery And Equipment [Member]
Property, Plant and Equipment, Useful Life	10 years
Maximum [Member] | Promotional Display [Member]
Property, Plant and Equipment, Useful Life	36 years
Minimum [Member] | Building And Building Improvements [Member]
Property, Plant and Equipment, Useful Life	15 years
Minimum [Member] | Machinery And Equipment [Member]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] | Promotional Display [Member]
Property, Plant and Equipment, Useful Life	30 years