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Income Taxes (Tables)
9 Months Ended
Jan. 31, 2016
Income Tax Disclosure [Abstract]  
Summary of Difference 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:
 
 
2016
2015
federal income tax rate
34.0%
34.0%
foreign tax rate differential
(6.6)
(6.0)
undistributed earnings from foreign subsidiaries
1.4
4.1
increase in liability for uncertain tax positions
2.9
3.5
tax effects of Chinese foreign exchange gains
3.5
0.2
other
0.5
1.8
 
35.7%
37.6%