Consolidated Statements of Operations (Parenthetical) - $ / shares	3 Months Ended																12 Months Ended
	Apr. 30, 2015	[1]	Jan. 31, 2015	[1]	Oct. 31, 2014	[1]	Jul. 31, 2014	[1]	Apr. 30, 2014	[1]	Jan. 31, 2014	[1]	Oct. 31, 2013	[1]	Jul. 31, 2013	[1]	Apr. 30, 2015		Apr. 30, 2014		Apr. 30, 2013
Diluted	$ 0.09		$ 0.10		$ 0.04		$ 0.05		$ 0.09		$ 0.09		$ 0.13		$ 0.06		$ 0.28	[1],[2]	$ 0.37	[1],[2]	$ 0.38	[2]
Class B Common Shares
Diluted																	$ 0.29	[3]	$ 0.37	[3]	$ 0.38

[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 $0.29, $0.37 and $0.38 for the years ended April 30, 2015, 2014 and 2013, respectively. See Note 1 to the Consolidated Financial Statements.

[3] Amounts adjusted for rounding