Income Taxes	6 Months Ended
Oct. 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 October 31, 2016 was an expense of 2.3 percent compared to an expense of 2.6 percent for the three months ended October 31, 2015. The Company’s effective tax rate for the six months ended October 31, 2016 was an expense of 2.5 percent compared to an expense of 0.2 percent for the six months ended October 31, 2015. The tax expense for the three and six months ended October 31, 2016 was primarily attributable to estimated foreign and state income tax expense. The tax expense for the three and six months ended October 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

6 Months Ended

Oct. 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 October 31, 2016 was an expense of 2.3 percent compared to an expense of 2.6 percent for the three months ended October 31, 2015. The Company’s effective tax rate for the six months ended October 31, 2016 was an expense of 2.5 percent compared to an expense of 0.2 percent for the six months ended October 31, 2015. The tax expense for the three and six months ended October 31, 2016 was primarily attributable to estimated foreign and state income tax expense. The tax expense for the three and six months ended October 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.