Income Taxes (Tables)

9 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Differences Between Statutory Income Tax Rate and Effective Income Tax Rate

The significant differences between the statutory income tax rate and effective income tax rate for the three and nine months ended December 31, 2017 and 2016 were as follows:

	For the Three Months Ended December 31,							For the Nine Months Ended December 31,
		2017			2016				2017			2016
Statutory income tax rate		31.5		%	35.0		%		31.5		%	35.0		%
Increase resulting from:
Excess tax benefits from stock-based awards		(7.0	)		—				(21.9	)		—
Credits		(2.1	)		(1.2	)			(2.1	)		(1.2	)
State taxes, net		3.7			3.3				3.7			3.3
Permanent differences		1.7			2.7				1.7			2.7
Effect of the Tax Reform Act on net deferred tax assets		42.1			—				19.6			—
Other		0.7			0.4				0.2			0.2
Effective tax rate		70.6		%	40.2		%		32.7		%	40.0		%