Unrecognized Tax Benefits	9 Months Ended
Jan. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	Unrecognized Tax Benefits & Impact of Tax Reform Act On December 22, 2017, H.R. 1, originally known as the Tax Cuts and Jobs Act (the “Tax Reform Act”) was enacted. The Tax Reform Act made significant changes to U.S. federal income tax laws including permanently lowering the U.S. corporate income tax rate from 35% to 21% effective January 1, 2018. As the Company has an April 30 fiscal year-end, the lower corporate income tax rate will be phased in, resulting in a U.S. statutory rate of 30.4% for the fiscal year ending April 30, 2018. The Company’s statutory federal tax rate will be 21% for fiscal years ending April 30, 2019 and beyond. U.S. GAAP requires the impact of tax legislation be recognized in the period in which the law was enacted. In December 2017, the SEC issued Staff Accounting Bulletin No. 118, which allows a company to report provisional numbers related to the Tax Reform Act and adjust those amounts during a measurement period not to extend beyond one year. For the three months ended January 31, 2018, the Company recorded a one-time tax benefit of $167 million due to a remeasurement of deferred tax assets and liabilities. In addition, applying the reduced rate of 30.4% to our first and second fiscal quarter earnings resulted in an $8M reduction to tax expense. These tax benefits represent provisional amounts and the Company’s best estimate. The provisional amounts are based on estimates of underlying timing differences (primarily related to uncertainty in fixed assets) and the Company’s current interpretations of the Tax Reform Act. The ultimate impact of the Tax Reform Act may differ from our provisional amounts due to changes in interpretations and assumptions we made as well as any forthcoming legislative action or regulatory guidance. The total amount of gross unrecognized tax benefits was $5,362 at April 30, 2017. At January 31, 2018, gross unrecognized tax benefits were $7,317. If this unrecognized tax benefit were ultimately recognized, $5,683 is the amount that would impact our effective tax rate. The total amount of accrued interest and penalties for such unrecognized tax benefits was $254 at January 31, 2018, and $141 at April 30, 2017. Net interest and penalties included in income tax expense for the nine months ended January 31, 2018, was a net expense of $113, with a net expense of $104 for the same period in 2017. A number of years may elapse before an uncertain tax position is audited and ultimately settled. It is difficult to predict the ultimate outcome or the timing of resolution for uncertain tax positions. It is reasonably possible that the amount of unrecognized tax benefits could significantly increase or decrease within the next twelve months. These changes could result from the expiration of the statute of limitations, examinations or other unforeseen circumstances. The IRS is currently examining tax year 2012. The Company has no other ongoing federal or state income tax examinations. The Company currently does not have any outstanding litigation related to tax matters. At this time, management believes it is reasonably possible the aggregate amount of unrecognized tax benefits will decrease by approximately $1,273 within the next twelve months. This expected decrease is due to the expiration of the statute of limitations related to certain federal and state income tax filing positions. The federal statute of limitations remains open for the tax years 2012 and forward. Tax years 2012 and forward are subject to audit by state tax authorities depending on open statute of limitations waivers and the tax code of each state.

Unrecognized Tax Benefits & Impact of Tax Reform Act

On December 22, 2017, H.R. 1, originally known as the Tax Cuts and Jobs Act (the “Tax Reform Act”) was enacted. The Tax Reform Act made significant changes to U.S. federal income tax laws including permanently lowering the U.S. corporate income tax rate from 35% to 21% effective January 1, 2018. As the Company has an April 30 fiscal year-end, the lower corporate income tax rate will be phased in, resulting in a U.S. statutory rate of 30.4% for the fiscal year ending April 30, 2018. The Company’s statutory federal tax rate will be 21% for fiscal years ending April 30, 2019 and beyond. U.S. GAAP requires the impact of tax legislation be recognized in the period in which the law was enacted. In December 2017, the SEC issued Staff Accounting Bulletin No. 118, which allows a company to report provisional numbers related to the Tax Reform Act and adjust those amounts during a measurement period not to extend beyond one year. For the three months ended January 31, 2018, the Company recorded a one-time tax benefit of $167 million due to a remeasurement of deferred tax assets and liabilities. In addition, applying the reduced rate of 30.4% to our first and second fiscal quarter earnings resulted in an $8M reduction to tax expense. These tax benefits represent provisional amounts and the Company’s best estimate. The provisional amounts are based on estimates of underlying timing differences (primarily related to uncertainty in fixed assets) and the Company’s current interpretations of the Tax Reform Act. The ultimate impact of the Tax Reform Act may differ from our provisional amounts due to changes in interpretations and assumptions we made as well as any forthcoming legislative action or regulatory guidance.

The total amount of gross unrecognized tax benefits was $5,362 at April 30, 2017. At January 31, 2018, gross unrecognized tax benefits were $7,317. If this unrecognized tax benefit were ultimately recognized, $5,683 is the amount that would impact our effective tax rate. The total amount of accrued interest and penalties for such unrecognized tax benefits was $254 at January 31, 2018, and $141 at April 30, 2017. Net interest and penalties included in income tax expense for the nine months ended January 31, 2018, was a net expense of $113, with a net expense of $104 for the same period in 2017.

A number of years may elapse before an uncertain tax position is audited and ultimately settled. It is difficult to predict the ultimate outcome or the timing of resolution for uncertain tax positions. It is reasonably possible that the amount of unrecognized tax benefits could significantly increase or decrease within the next twelve months. These changes could result from the expiration of the statute of limitations, examinations or other unforeseen circumstances. The IRS is currently examining tax year 2012. The Company has no other ongoing federal or state income tax examinations. The Company currently does not have any outstanding litigation related to tax matters. At this time, management believes it is reasonably possible the aggregate amount of unrecognized tax benefits will decrease by approximately $1,273 within the next twelve months. This expected decrease is due to the expiration of the statute of limitations related to certain federal and state income tax filing positions.

The federal statute of limitations remains open for the tax years 2012 and forward. Tax years 2012 and forward are subject to audit by state tax authorities depending on open statute of limitations waivers and the tax code of each state.