Consolidated Statements of Operations (Parenthetical) - $ / shares		3 Months Ended								12 Months Ended
		Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2017		Apr. 30, 2016		Apr. 30, 2015
Diluted		$ 0.34	$ 0.08	$ 0.01	$ 0.06	$ 0.12	$ 0.07	$ 0.07	$ 0.09	$ 0.49	[1]	$ 0.35	[1]	$ 0.28	[1]
Class B Common Shares
Diluted	[2]									$ 0.49		$ 0.35		$ 0.29

[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 per share for Class B shares under the two-class method are $0.49, $0.35 and $0.29 for the years ended April 30, 2017, 2016 and 2015, respectively. See Note 1 to the Consolidated Financial Statements.

[2] Amounts adjusted for rounding