Earnings per Share (Tables)

12 Months Ended

Apr. 30, 2017

Earnings Per Share [Abstract]

Computation of earnings per common share, basic and diluted

The following table sets forth the computation of net income per common share and net income per common share – assuming dilution under the two-class method.

		Year Ended April 30,
		2017			2016			2015
Net income		$	592.3		$	688.7		$	344.9
Less: Net income allocated to participating securities		2.8			3.0			2.2
Net income allocated to common stockholders		$	589.5		$	685.7		$	342.7
Weighted-average common shares outstanding	115,471,395			118,918,701			103,038,271
Add: Dilutive effect of stock options		107,029			41,113			5,283
Weighted-average common shares outstanding – assuming dilution	115,578,424			118,959,814			103,043,554
Net income per common share		$	5.11		$	5.77		$	3.33
Net income per common share – assuming dilution		$	5.10		$	5.76		$	3.33