Cash collateral for insurance obligations.

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- Definition

Line of Credit Facility, Number of Renewal Options

+ References

No definition available.

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- Definition

Line of Credit Facility, Renewal Term

+ References

No definition available.

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- Definition

Number of Unsecured Senior Notes Held

+ References

No definition available.

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- Definition

Sublimit for issuance of standby letters of credit

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: 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=64930739&loc=d3e28878-108400

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-Topic 835
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

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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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Balance Type:	na
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- Definition

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.

+ Details

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Balance Type:	na
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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Fair value of the amount outstanding under the credit facility.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Debt (Narrative) (Details)	3 Months Ended	12 Months Ended
Debt (Narrative) (Details)	Apr. 30, 2016 USD ($) option	Jan. 28, 2017 USD ($) note	Jan. 30, 2016 USD ($) note
Debt Instrument [Line Items]
Number of unsecured senior notes held \| note		3	3
Unamortized discount and debt issuance costs		$ 3,500,000	$ 4,000,000
Amount of borrowings outstanding		0
Collateral trust		56,600,000	56,400,000
Unsecured Series A and B Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of unsecured senior notes		$ 150,000,000
Number of unsecured senior notes held \| note		2
Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Current borrowing capacity	$ 600,000,000
Sublimit for issuance of standby letters of credit	300,000,000
Maximum borrowing capacity for revolving credit facility (up to)	$ 200,000,000
Basis points margin over LIBOR		1.00%
Number of renewal options (up to) \| option	2
Renewal term	1 year
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Letters of credit		$ 11,600,000	15,300,000
Trade Letters Of Credit [Member]
Debt Instrument [Line Items]
Letters of credit		$ 26,500,000	$ 32,000,000
Senior Notes due 2024 [Member] \| 3.375% Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Unsecured senior notes interest rate (in percentage)		3.375%	3.375%
Aggregate principal amount of unsecured senior notes		$ 250,000,000
Senior Notes due 2018 [Member] \| Series A Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Unsecured senior notes interest rate (in percentage)		6.38%	6.38%
Aggregate principal amount of unsecured senior notes		$ 85,000,000
Senior Notes due 2021 [Member] \| Series B Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Unsecured senior notes interest rate (in percentage)		6.53%	6.53%
Aggregate principal amount of unsecured senior notes		$ 65,000,000
Level 1 [Member]
Debt Instrument [Line Items]
Unsecured senior notes estimated fair value		$ 419,000,000	$ 423,000,000