Share-Based Compensation Level 4 (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Jun. 30, 2011 years	Jun. 30, 2010 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Item]
Remaining shares available for grant	2,982,457
Weighted-average assumptions used for options granted:
Risk-free interest rate	2.40%	2.73%
Expected life of options	5.53	5.52
Exptected dividend yield of stock	1.31%	1.54%
Expected volatility of stock	29.92%	30.19%
Estimated forfeiture rate	2.08%	2.27%
Summary of share option activity:
Number of Options, Outstanding, Beginning of Period	3,274,395
Weighted Average Exercise Price, Outstanding, Beginning of Period	$ 25.95
Number of Options, Granted	293,088
Weighted Average Exercise Price, Granted	$ 36.08
Number of Options, Exercised	(119,238)
Weighted Average Exercise Price, Exercised	$ 22.23
Number of Options, Forfeited	(100)
Weighted Average Exercise Price, Forfeited	$ 27.68
Number of Options, Canceled	1,150
Weighted Average Exercise Price, Canceled	$ 27.88
Number of Options, Outstanding, End of Period	3,446,995
Weighted Average Exercise Price, Outstanding, End of Period	$ 26.94
Average Remaining Contractual Term, Outstanding	5.81
Aggregate Intrinsic Value, Outstanding	$ 28,044
Number of Options, Exercisable	2,471,947
Weighted Average Exercise Price, Exercisable	$ 25.72
Average Remaining Contractual Term, Exercisable	4.79
Aggregate Intrinsic Value, Exercisable	22,889
Non-vested stock options outstanding expected to vest	952,860
Common Stock, Fair Market Value Per Share	$ 34.98
Total intrinsic value of stock options exercised	1,578	1,695
Net cash proceeds from the exercise of stock options	2,457	2,226
Tax benefit from stock option exercises	610	659
Weighted average grant date fair value of stock option grants, per share	$ 9.97	$ 8.82
Summary of non-vested restricted share activity:
Unrecognized compensation cost related to nonvested share-based compensation granted	16,603
Weighted average period for recognition of unrecognized compensation cost	2.84
Stock Appreciation Rights (SARs)
Summary of non-vested restricted share activity:
Number of Restricted Shares, Non-vested at Beginning of Period	400,951
Weighted-Average Grant Date Fair Value, Non-vested at Beginning of Period	$ 29.70
Number of Restricted Shares, Granted	213,271
Weighted-Average Grant Date Fair Value, Granted	$ 36.07
Number of Restricted Shares, Vested	(65,390)
Weighted-Average Grant Date Fair Value, Vested	$ 30.84
Number of Restricted Shares, Canceled	(750)
Weighted-Average Grant Date Fair Value, Canceled	$ 33.98
Number of Restricted Shares, Non-vested at End of Period	548,082
Weighted-Average Grant Date Fair Value, Non-vested at End of Period	$ 32.04
FairValueOfOutstandingStockAppreciationRights	1,198	864
Restricted Stock
Summary of non-vested restricted share activity:
Fair Value, Share-based Payment Awards, Other than Options	2,017
Restricted Stock Units (RSUs)
Summary of non-vested restricted share activity:
FairValueOfOutstandingCashSettledRestrictedShareUnits	$ 1,614	$ 1,120

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.28,29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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