Stock-Based Compensation Stock Options (Tables)

6 Months Ended

Sep. 30, 2016

Share-based Compensation Arrangement by Share-based Payment Award

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Three Months Ended September 30,				Six Months Ended September 30,
	2016		2015		2016		2015
Stock options	$	2,042	$	2,234	$	4,284	$	5,039
Restricted stock and restricted stock units	12,741		12,455		27,314		26,353
Employee stock purchase plan	116		116		417		440
Affiliate management equity plans	435		1,302		19,934		2,603
Non-employee director awards	1,150		1,150		1,150		1,150
Performance share units	1,019		907		1,869		1,443
Employee stock trust	7		7		13		13
Total stock-based compensation expense	$	17,510	$	18,171	$	54,981	$	37,041

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

	Six Months Ended September 30,
	2016				2015
	Number of Shares		Weighted-Average Exercise Price Per Share		Number of Shares		Weighted-Average Exercise Price Per Share
Options outstanding at March 31	4,506		$	38.48	4,432		$	39.58
Granted	753		31.31		876		54.52
Exercised	(109	)	28.31		(192	)	32.42
Canceled/forfeited	(319	)	36.42		(388	)	95.68
Options outstanding at September 30	4,831		$	37.73	4,728		$	38.04

Management [Member]

Share-based Compensation Arrangement by Share-based Payment Award

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

	Six Months Ended September 30,
	2016		2015
Expected dividend yield	1.45	%	1.18	%
Risk-free interest rate	1.25	%	1.44	%
Expected volatility	30.95	%	24.37	%
Expected life (in years)	5.02		4.97

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 [Member]

Share-based Compensation Arrangement by Share-based Payment Award

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

	2016		2015
Expected dividend yield	2.87	%	1.46	%
Risk-free interest rate	0.89	%	0.86	%
Expected volatility	26.01	%	22.63	%