Income Taxes	3 Months Ended
Jul. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company computes its interim provision for income taxes by applying the estimated annual effective tax rate to income from operations and adjusts the provision for discrete tax items occurring in the period. The Company’s effective tax rate for the three months ended July 31, 2016 was an expense of 2.7 percent compared to a benefit of 0.9 percent for the three months ended July 31, 2015. The tax expense for the three months ended July 31, 2016 was primarily attributable to estimated foreign and state income tax expense. The tax benefit for the three months ended July 31, 2015 was primarily attributable to foreign and state income tax expense, with an offset from the income tax benefit from research and development credits provided by the State of Texas.

Income Taxes

3 Months Ended

Jul. 31, 2016

The Company computes its interim provision for income taxes by applying the estimated annual effective tax rate to income from operations and adjusts the provision for discrete tax items occurring in the period. The Company’s effective tax rate for the three months ended July 31, 2016 was an expense of 2.7 percent compared to a benefit of 0.9 percent for the three months ended July 31, 2015. The tax expense for the three months ended July 31, 2016 was primarily attributable to estimated foreign and state income tax expense. The tax benefit for the three months ended July 31, 2015 was primarily attributable to foreign and state income tax expense, with an offset from the income tax benefit from research and development credits provided by the State of Texas.