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Income Taxes	9 Months Ended
Income Taxes	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective income tax rate for the three and nine month periods ended January 31, 2015 was 33.7% and 33.5%, respectively, compared with 41.4% and 38.9%, respectively, in the comparable periods of the prior fiscal year. The lower effective tax rates in fiscal 2015 were the result of the Company operating at a higher net income than in the prior year periods and more favorable permanent tax differences, including finalizing a federal research and experimentation tax credit for fiscal years 2011 through 2014 of $1.2 million during the first nine months of the current fiscal year.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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