Income Taxes	3 Months Ended
Apr. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 7. Income Taxes For the three months ended April 30, 2017 and 2016, our effective tax rates were 5.0% and 39.1%, respectively. During the three months ended April 30, 2017 as compared to the prior year period, our effective tax rate decreased primarily due to the adoption of ASU 2016-09 on February 1, 2017. The adoption of this guidance on a prospective basis resulted in the discrete recognition of excess tax benefits in our provision for income taxes of $13.9 million, which lowered our effective tax rate by 37 percentage points for the three months ended April 30, 2017.

Income Taxes

3 Months Ended

Apr. 30, 2017

Note 7. Income Taxes

For the three months ended April 30, 2017 and 2016, our effective tax rates were 5.0% and 39.1%, respectively. During the three months ended April 30, 2017 as compared to the prior year period, our effective tax rate decreased primarily due to the adoption of ASU 2016-09 on February 1, 2017. The adoption of this guidance on a prospective basis resulted in the discrete recognition of excess tax benefits in our provision for income taxes of $13.9 million, which lowered our effective tax rate by 37 percentage points for the three months ended April 30, 2017.