Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2012

Stock-based Compensation Disclosure [Abstract]

Stock option transactions

	Number of shares		Weighted-average exercise price per share
Options outstanding at March 31, 2009	5,554		$	64.09
Granted	1,457		26.82
Exercised	(72	)	25.40
Canceled/forfeited	(885	)	49.24
Options outstanding at March 31, 2010	6,054		57.75
Granted	729		33.12
Exercised	(634	)	21.85
Canceled/forfeited	(730	)	48.94
Options outstanding at March 31, 2011	5,419		59.82
Granted	810		33.99
Exercised	(117	)	25.32
Canceled/forfeited	(488	)	48.80
Options outstanding at March 31, 2012	5,624		$	57.78

Schedule of Share-based Compensation, Options Outstanding under Stock Option Plans by Exercise Price Range

Exercise Price Range	Option Shares Outstanding	Weighted‑Average Exercise Price Per Share		Weighted‑Average Remaining Life (in years)
$ 12.65 - $ 25.00	86	$	14.82	4.4
25.01 - 35.00	3,284	31.61		5.6
35.01 - 94.00	304	55.65		0.6
94.01 - 100.00	550	95.19		2.3
100.01 - 134.97	1,400	107.56		2.2
	5,624

Schedule of Share-based Compensation, Options Exercisable under Stock Option Plans by Exercise Price Range

Exercise Price Range	Option Shares Exercisable	Weighted‑Average Exercise Price Per Share
$ 12.65 - $ 25.00	51	$	14.73
25.01 - 35.00	1,134	31.13
35.01 - 94.00	304	55.65
94.01 - 100.00	550	95.19
100.01 - 134.97	1,295	108.11
	3,334

Schedule of Nonvested Share Activity

	Number of Shares		Weighted‑Average Grant Date Fair Value
Shares unvested at March 31, 2011	2,559		$	15.89
Granted	810		13.13
Vested (1)	(961	)	17.84
Canceled/forfeited	(118	)	14.78
Shares unvested at March 31, 2012	2,290		$	14.00

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

	2012		2011		2010
Expected dividend yield	1.39	%	1.39	%	1.45	%
Risk-free interest rate	1.95	%	2.37	%	2.86	%
Expected volatility	47.16	%	52.64	%	55.26	%
Expected lives (in years)	5.12		5.18		5.17

Schedule of Share-based Payment Award Performance Share Valuation Weighted Average Assumptions

Expected dividend yield	1.33	%
Risk-free interest rate	3.30	%
Expected volatility	36.02	%

Restricted stock and restricted stock unit transactions

	Number of shares		Weighted-average grant date value
Unvested shares at March 31, 2009	1,341		$	51.26
Granted	786		22.35
Vested	(467	)	58.83
Canceled/forfeited	(55	)	53.37
Unvested shares at March 31, 2010	1,605		34.80
Granted	1,867		33.02
Vested	(617	)	38.62
Canceled/forfeited	(218	)	30.42
Unvested shares at March 31, 2011	2,637		33.01
Granted	1,370		33.48
Vested	(1,075	)	31.49
Canceled/forfeited	(59	)	32.68
Unvested shares at March 31, 2012	2,873		$	33.83