Condensed Consolidated Statements of Operations (Parenthetical) - $ / shares		3 Months Ended		9 Months Ended
		Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Diluted	[1]	$ 0.18	$ 0.08	$ 0.36	$ 0.15
Class B Common Shares
Diluted	[2]	$ 0.18	$ 0.08	$ 0.35	$ 0.15

[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 $0.18 and $0.08 for the three months ended January 31, 2018 and 2017, and $0.35 and $0.15 for the nine months ended January 31, 2018 and 2017, respectively. See Note D to the Condensed Consolidated Financial Statements.

[2] Amounts adjusted for rounding