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Earnings Per Share (Schedule Of Convertible Debt, By Dilutive and Anti-Dilutive Classification) (Detail) (Convertible Debt [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
--- | --- | ---
New 4.0% Notes [Member] |  |  |  |
Dilutive Securities [Abstract] |  |  |  |
Convertible debt, outstanding principal amount | $ 105,322 | [1] | $ 105,322 | [1]
New 4.25% Notes [Member] |  |  |  |
Dilutive Securities [Abstract] |  |  |  |
Convertible debt, outstanding principal amount | 97,000 | [1] | 97,000 | [1]
Original 4.0% Notes [Member] |  |  |  |
Dilutive Securities [Abstract] |  |  |  |
Convertible debt, outstanding principal amount | 9,600 | [2] | 9,700 | [2]
Original 4.25% Notes [Member] |  |  |  |
Dilutive Securities [Abstract] |  |  |  |
Convertible debt, outstanding principal amount | 3,000 | [2] | 3,000 | [2]
Total Dilutive Convertible Debt [Member] |  |  |  |
Dilutive Securities [Abstract] |  |  |  |
Convertible debt, outstanding principal amount | $ 215,000 |  | $ 215,000 |
[1] | Dilutive shares associated with the New Convertible Notes are attributable to the premium over the respective conversion prices.
[2] | Dilutive shares associated with the Original Convertible Notes are attributable to the underlying principal amounts.

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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