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Long-Term Debt, Exclusive of Current Installments (Parenthetical) (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2015 | Jan. 31, 2015 | Nov. 01, 2014
6.95% Ten-Year Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 6.95% |  |
Maturity date | Apr. 15, 2019 |  |
Unamortized debt discount | $ 240 | $ 294 | $ 311
Effective interest rate | 6.98% |  |
2.50% Ten-Year Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 2.50% |  |
Maturity date | May 15, 2023 |  |
Unamortized debt discount | $ 335 | 367 | 378
Effective interest rate | 2.51% |  |
2.75% Seven-Year Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 2.75% |  |
Maturity date | Jun. 15, 2021 |  |
Unamortized debt discount | $ 418 | $ 475 | $ 494
Effective interest rate | 2.76% |  |

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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 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 + Details
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