Income Taxes	9 Months Ended
Jan. 31, 2017
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. For all periods presented, the Company was in a domestic net operating loss position, as such all income tax expenses incurred during the periods presented relate to foreign and state jurisdictions. The Company’s effective tax rate for the three months ended January 31, 2017 was an expense of 4.7 percent compared to a benefit of 5.0 percent for the three months ended January 31, 2016. The Company’s effective tax rate for the nine months ended January 31, 2017 was an expense of 3.0 percent compared to a benefit of 0.7 percent for the nine months ended January 31, 2016. The tax expense for the three and nine months ended January 31, 2017 was primarily attributable to estimated foreign and state income tax expense with a partial offset from the income tax benefit from research and development credits provided by the State of Texas. The tax benefit for the three and nine months ended January 31, 2016 was primarily attributable to a decrease in state taxes payable as a result of increased benefits recognized for research and development credits provided by the State of Texas.

Income Taxes

9 Months Ended

Jan. 31, 2017

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. For all periods presented, the Company was in a domestic net operating loss position, as such all income tax expenses incurred during the periods presented relate to foreign and state jurisdictions. The Company’s effective tax rate for the three months ended January 31, 2017 was an expense of 4.7 percent compared to a benefit of 5.0 percent for the three months ended January 31, 2016. The Company’s effective tax rate for the nine months ended January 31, 2017 was an expense of 3.0 percent compared to a benefit of 0.7 percent for the nine months ended January 31, 2016. The tax expense for the three and nine months ended January 31, 2017 was primarily attributable to estimated foreign and state income tax expense with a partial offset from the income tax benefit from research and development credits provided by the State of Texas. The tax benefit for the three and nine months ended January 31, 2016 was primarily attributable to a decrease in state taxes payable as a result of increased benefits recognized for research and development credits provided by the State of Texas.