Income Taxes	6 Months Ended
Oct. 31, 2015
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 October 31, 2015 was an expense of 2.6 percent compared to an expense of 2.7 percent for the three months ended October 31, 2014. For continuing operations, the Company’s effective tax rate for the six months ended October 31, 2015 was an expense of 0.2 percent compared to an expense of 1.4 percent for the six months ended October 31, 2014. The tax expense for the three and six months ended October 31, 2015 were primarily attributable to foreign and state income tax expense, with an offset from the income tax benefit from the Texas research and development credit. The tax expense for the three and six months ended October 31, 2014 were primarily attributable to estimated foreign and state income tax expense compared to a consolidated pre-tax book loss.

Income Taxes

6 Months Ended

Oct. 31, 2015

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 October 31, 2015 was an expense of 2.6 percent compared to an expense of 2.7 percent for the three months ended October 31, 2014. For continuing operations, the Company’s effective tax rate for the six months ended October 31, 2015 was an expense of 0.2 percent compared to an expense of 1.4 percent for the six months ended October 31, 2014. The tax expense for the three and six months ended October 31, 2015 were primarily attributable to foreign and state income tax expense, with an offset from the income tax benefit from the Texas research and development credit. The tax expense for the three and six months ended October 31, 2014 were primarily attributable to estimated foreign and state income tax expense compared to a consolidated pre-tax book loss.