Income Taxes (Tables)

3 Months Ended

Jul. 31, 2016

Income Tax Disclosure [Abstract]

Summary of Differences in Income Tax Expense at Federal Income Tax Rate and Effective Income Tax Rate

The following schedule summarizes the factors that are attributable to the difference between income tax expense at the federal income tax rate and the effective income tax rate reflected in the consolidated financial statements:

	2017			2016
federal income tax rate		34.0	%		34.0	%
U.S state income tax expense		1.4			0.8
tax effects of Chinese foreign exchange gains		1.1			0.4
increase in liability for uncertain tax positions		0.5			0.3
other		0.8			1.0
		37.8	%		36.5	%