Income Taxes	3 Months Ended
Jul. 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 July 31, 2015 was a benefit of 0.9 percent compared to a benefit of 0.1 percent for the three months ended July 31, 2014. 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 the Texas research and development credit. During the three months ended July 31, 2014, the foreign and state income tax expense was primarily offset by the income tax benefit from the Texas state research and development credit.

Income Taxes

3 Months Ended

Jul. 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 July 31, 2015 was a benefit of 0.9 percent compared to a benefit of 0.1 percent for the three months ended July 31, 2014. 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 the Texas research and development credit. During the three months ended July 31, 2014, the foreign and state income tax expense was primarily offset by the income tax benefit from the Texas state research and development credit.