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Fair Value Of Financial Instruments (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2012 | Jan. 31, 2013 | Jan. 15, 2013 Derivative | Jan. 31, 2013 Interest Rate Derivatives [Member] | Jan. 31, 2013 Second Lien Notes [Member] | Jan. 31, 2013 Senior Subordinated Notes Due 2019 Notes [Member] | Jan. 31, 2013 Convertible Bonds [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items] |  |  |  |  |  |  |
Fair value of fixed rate debt including the senior subordinated notes and the Series 2005R-2 converted bonds |  | $ 342,349 |  |  |  |  |
Carrying value of fixed rate debt including the senior subordinated notes and the Series 2005R-2 converted bonds |  | 344,608 |  |  |  |  |
Revolver, carrying value |  | 141,700 |  |  |  |  |
Fixed rate debt, due date |  |  |  |  | Jul. 15, 2014 | Feb. 15, 2019 | Jan. 01, 2025
Number of forward starting interest rate derivatives |  |  | 2 |  |  |  |
Total notional amount of interest rate derivatives |  |  |  | 150,000 |  |  |
Interest payable rate |  |  |  | 1.40% |  |  |
Second Lien Notes callable date |  |  |  |  | Jan. 15, 2013 |  |
Interest rate derivative maturity date |  |  |  | Mar. 15, 2016 |  |  |
Forward starting interest rate derivative agreements | 75,000 |  |  |  |  |  |
Other loss (income) | $ 3,626 |  |  |  |  |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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