Common Shares (Tables)

9 Months Ended

Jan. 31, 2017

Stockholders' Equity Note [Abstract]

Common Shares Information

The following table sets forth common share information.

	January 31, 2017	April 30, 2016
Common shares authorized	300,000,000	300,000,000
Common shares outstanding	116,443,204	116,306,894
Treasury shares	30,054,526	30,190,836