Common Shares (Tables)

9 Months Ended

Jan. 31, 2016

Stockholders' Equity Note [Abstract]

Common Shares Information

The following table sets forth common share information.

	January 31, 2016	April 30, 2015
Common shares authorized	300,000,000	300,000,000
Common shares outstanding	119,685,003	119,577,333
Treasury shares	26,812,727	26,920,397