Condensed Consolidated Statements of Operations (Parenthetical) (USD $)	3 Months Ended				9 Months Ended
	Jan. 31, 2014		Jan. 31, 2013		Jan. 31, 2014		Jan. 31, 2013
Diluted	$ 0.09	[1]	$ 0.08	[1]	$ 0.28	[1]	$ 0.27	[1]
Class B Common Shares
Diluted	$ 0.09		$ 0.08		$ 0.28		$ 0.27

[1] Basic per share amounts are the same for Class A and Class B shares. Diluted per share amounts for Class A shares are shown above. Diluted earnings per share for Class B shares under the two-class method are $0.09 and $0.08 for the three months ended January 31, 2014 and 2013 and $0.28 and $0.27 for the nine months ended January 31, 2014 and 2013, respectively. See Note D to the Condensed Consolidated Financial Statements.