Income Taxes	6 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income taxes are recorded in our quarterly financial statements based on our estimated annual effective income tax rate, subject to adjustments for discrete events, should they occur. The effective rates used in the calculation of income taxes were 37.7% and 35.9% for the three months ended September 30, 2017 and 2016, respectively. The effective rates used in the calculation of income taxes were 36.8% and 35.5% for the six months ended September 30, 2017 and 2016, respectively. The increase in the effective tax rate for the three and six months ended September 30, 2017 was primarily due to state tax increases that occurred during the period. The balance in our uncertain tax liability was $8.1 million at September 30, 2017 and $3.7 million March 31, 2017. The increase in our uncertain tax liability was related to a measurement period adjustment associated with our Fleet acquisition. We recognize interest and penalties related to uncertain tax positions as a component of income tax expense. We did not incur any material interest or penalties related to income taxes in any of the periods presented.

Income Taxes

6 Months Ended

Sep. 30, 2017

Income taxes are recorded in our quarterly financial statements based on our estimated annual effective income tax rate, subject to adjustments for discrete events, should they occur. The effective rates used in the calculation of income taxes were 37.7% and 35.9% for the three months ended September 30, 2017 and 2016, respectively. The effective rates used in the calculation of income taxes were 36.8% and 35.5% for the six months ended September 30, 2017 and 2016, respectively. The increase in the effective tax rate for the three and six months ended September 30, 2017 was primarily due to state tax increases that occurred during the period.

The balance in our uncertain tax liability was $8.1 million at September 30, 2017 and $3.7 million March 31, 2017. The increase in our uncertain tax liability was related to a measurement period adjustment associated with our Fleet acquisition. We recognize interest and penalties related to uncertain tax positions as a component of income tax expense. We did not incur any material interest or penalties related to income taxes in any of the periods presented.