Consolidated Statements of Operations (Parenthetical) (USD $)	3 Months Ended																12 Months Ended
	Apr. 30, 2014		Jan. 31, 2014		Oct. 31, 2013		Jul. 31, 2013		Apr. 30, 2013		Jan. 31, 2013		Oct. 31, 2012		Jul. 31, 2012		Apr. 30, 2014		Apr. 30, 2013		Apr. 30, 2012
Diluted	$ 0.09	[1]	$ 0.09	[1]	$ 0.13	[1]	$ 0.06	[1]	$ 0.11	[1]	$ 0.08	[1]	$ 0.10	[1]	$ 0.09	[1]	$ 0.37	[1],[2]	$ 0.38	[1],[2]	$ 0.42	[2]
Class B Common Shares
Diluted																	$ 0.37	[3]	$ 0.38	[3]	$ 0.43	[3]

[1] Quarterly amounts may not sum to full year total due to rounding.

[2] 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 per share for Class B shares under the two-class method are $0.37, $0.38 and $0.43 for the years ended April 30, 2014, 2013 and 2012, respectively. See Note 1 to the Consolidated Financial Statements.

[3] Amounts adjusted for rounding