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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%

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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)(1))



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher FASB



-Name Accounting Standards Codification



-Topic 835



-SubTopic 30



-Section 45



-Paragraph 2



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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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



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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 835



-SubTopic 30



-Section 45



-Paragraph 1A



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