Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Three Months Ended December 31,				Nine Months Ended December 31,
	2015		2014		2015		2014
Stock options	$	2,231	$	2,747	$	7,270	$	8,964
Restricted stock and restricted stock units	13,313		11,762		39,666		35,051
Employee stock purchase plan	108		105		548		502
Affiliate management equity plans	1,212		1,301		3,815		3,904
Non-employee director awards	—		—		1,150		1,550
Performance share units	665		290		2,108		772
Employee stock trust	6		30		19		191
Total stock-based compensation expense	$	17,535	$	16,235	$	54,576	$	50,934

Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]

	Nine Months Ended December 31,
	2015				2014
	Number of Shares		Weighted-Average Exercise Price Per Share		Number of Shares		Weighted-Average Exercise Price Per Share
Options outstanding at March 31	4,432		$	39.58	4,801		$	43.02
Granted	876		54.52		917		47.65
Exercised	(254	)	31.96		(615	)	30.85
Canceled/forfeited	(418	)	91.83		(570	)	90.38
Options outstanding at December 31	4,636		$	38.11	4,533		$	39.66

Management [Member]

Share-based Compensation Arrangement by Share-based Payment Award

Assumptions used to determine the weighted-average fair value of option grants

	Nine Months Ended December 31,
	2015		2014
Expected dividend yield	1.18	%	1.04	%
Risk-free interest rate	1.44	%	1.51	%
Expected volatility	24.37	%	29.53	%
Expected life (in years)	4.97		4.94

Chief Executive Officer [Member]

Share-based Compensation Arrangement by Share-based Payment Award

Assumptions used to determine the weighted-average fair value of option grants

Expected dividend yield	1.48	%
Risk-free interest rate	0.86	%
Expected volatility	44.05	%

Key Employees

Share-based Compensation Arrangement by Share-based Payment Award

Assumptions used to determine the weighted-average fair value of option grants

	2015		2014
Expected dividend yield	1.46	%	1.33	%
Risk-free interest rate	0.86	%	0.75	%
Expected volatility	22.63	%	30.81	%