Stock-Based Compensation (Stock-Based Awards Issued In Grants) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Stock Appreciation Rights (SARs) [Member]
Numbers granted	170,400	153,600
Exercise price	$ 37.86	$ 39.71
Grant date fair value	$ 7.46	$ 8.35
Restricted Stock Units (RSUs) [Member]
Numbers granted	57,100	38,400
Grant date fair value	$ 37.86	$ 39.71
Performance Share Awards (PSAs) [Member]
Numbers granted	42,600	38,400
Grant date fair value	$ 31.95	$ 33.95

The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(d)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: 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)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Namespace Prefix:	us-gaap
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant