Income Taxes	9 Months Ended
Jan. 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. For continuing operations, the Company’s effective tax rate for the three months ended January 31, 2016 was a benefit of 5.0 percent compared to an expense of 8.5 percent for the three months ended January 31, 2015. For continuing operations, the Company’s effective tax rate for the nine months ended January 31, 2016 was a benefit of 0.7 percent compared to an expense of 2.5 percent for the nine months ended January 31, 2015. The tax benefit for the three and nine months ended January 31, 2016 were primarily attributable to an estimated decrease in state taxes payable primarily as a result of increased benefits recognized for Texas R&D credits and refunds related to prior year state and foreign returns. The tax expense for the three and nine months ended January 31, 2015 were primarily attributable to estimated foreign and state income tax expense.

Income Taxes

9 Months Ended

Jan. 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. For continuing operations, the Company’s effective tax rate for the three months ended January 31, 2016 was a benefit of 5.0 percent compared to an expense of 8.5 percent for the three months ended January 31, 2015. For continuing operations, the Company’s effective tax rate for the nine months ended January 31, 2016 was a benefit of 0.7 percent compared to an expense of 2.5 percent for the nine months ended January 31, 2015. The tax benefit for the three and nine months ended January 31, 2016 were primarily attributable to an estimated decrease in state taxes payable primarily as a result of increased benefits recognized for Texas R&D credits and refunds related to prior year state and foreign returns. The tax expense for the three and nine months ended January 31, 2015 were primarily attributable to estimated foreign and state income tax expense.