Share-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Restricted Shares

A summary of the Company’s restricted shares granted under the Plan is presented below:

Restricted Shares	Shares (in thousands)		Weighted-Average Grant-Date Fair Value
Vested and Nonvested at March 31, 2013	421.3		$	11.01
Granted	126.6		30.19
Vested and issued	(104.8	)	9.98
Forfeited	(5.6	)	15.11
Vested and nonvested at March 31, 2014	437.5		16.76
Vested at March 31, 2014	69.6		9.34
Granted	106.9		33.33
Vested and issued	(154.4	)	13.37
Forfeited	(27.7	)	21.45
Vested and nonvested at March 31, 2015	362.3		22.74
Vested at March 31, 2015	76.6		11.62
Granted	266.1		42.41
Vested and issued	(155.6	)	18.31
Forfeited	(5.0	)	39.61
Vested and nonvested at March 31, 2016	467.8		35.22
Vested at March 31, 2016	69.8		14.76

Stock Options, Valuation Assumptions

The weighted-average grant-date fair values of the options granted during 2016, 2015, and 2014 were $17.24, $15.95, and $13.94, respectively.

	Year Ended March 31,
	2016		2015		2014
Expected volatility	40.2	%	47.3	%	48.0	%
Expected dividends	—		—		—
Expected term in years	6.0		6.0		6.0
Risk-free rate	1.7	%	2.2	%	1.3	%

Stock Option Activity

A summary of option activity under the Plan is as follows:

Options	Shares (in thousands)		Weighted-Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (in thousands)
Outstanding at March 31, 2013	1,386.4		$	10.43
Granted	227.7		29.94
Exercised	(605.0	)	9.76
Forfeited or expired	(14.2	)	14.56
Outstanding at March 31, 2014	994.9		15.24
Granted	317.9		33.54
Exercised	(386.3	)	10.24
Forfeited or expired	(55.3	)	26.77
Outstanding at March 31, 2015	871.2		23.40
Granted	208.2		42.13
Exercised	(348.0	)	19.22
Forfeited or expired	(3.7	)	35.72
Outstanding at March 31, 2016	727.7		30.70		7.6	$	16,512
Exercisable at March 31, 2016	308.4		21.75		6.5	9,756