Consolidated Statements of Operations (Parenthetical) - $ / shares		3 Months Ended																12 Months Ended
		Apr. 30, 2018	[1]	Jan. 31, 2018	[1]	Oct. 31, 2017	[1]	Jul. 31, 2017	[1]	Apr. 30, 2017	[1]	Jan. 31, 2017	[1]	Oct. 31, 2016	[1]	Jul. 31, 2016	[1]	Apr. 30, 2018		Apr. 30, 2017		Apr. 30, 2016
Diluted		$ 0.04		$ 0.18		$ 0.08		$ 0.09		$ 0.34		$ 0.08		$ 0.01		$ 0.06		$ 0.40	[1],[2]	$ 0.49	[1],[2]	$ 0.35	[2]
Class B Common Shares
Diluted	[3]																	$ 0.39		$ 0.49		$ 0.35

[1] Table may contain rounding

[2] Diluted per share amounts for Class A shares are shown above. Diluted per share for Class B shares under the two-class method are $0.39, $0.49 and $0.35 for the years ended April 30, 2018, 2017 and 2016, respectively. See Note 1 to the Consolidated Financial Statements.

[3] Amounts adjusted for rounding