Debt Instrument, Covenant, Aggregate Amount Of Priority Indebtedness,Maximum

No definition available.

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- Definition

Debt Instrument, Covenant, Capital Expenditures, Maximum, During Fiscal Period One

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant, Capital Expenditures, Maximum During Subsequent Fiscal Periods

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant, Fixed Charge Coverage Ratio, Minimum

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant, Levarage Ratio, Maximum

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant, Net Capital Assets, Minimum

+ References

No definition available.

+ Details

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

- Definition

Debt Instrument, Covenant, Ratio Of Indebtedness To Earnings Before Interest, Tax, Depreiation, Amortization, Maximum

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant, Retention Of Future Income, Percentage, Minimum

+ References

No definition available.

+ Details

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- Definition

Line Of Credit Facility, Additional Borrowing Capacity

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

Interest rate stated in the contractual debt agreement.

+ 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)(1))

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

+ Details

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Balance Type:	na
Period Type:	instant

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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 borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- 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.

+ References

Reference 1: 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.

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 210.5-02.19(b),22(b))

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Long-term Debt - Narrative (Details) (USD $)	12 Months Ended		12 Months Ended						0 Months Ended		0 Months Ended
Long-term Debt - Narrative (Details) (USD $)	Feb. 28, 2013 Senior Notes [Member] Unsecured Senior Notes Due March 2012 through March 2018 [Member]	Mar. 31, 2008 Senior Notes [Member] Unsecured Senior Notes Due March 2012 through March 2018 [Member]	Feb. 28, 2013 Senior Notes [Member] Unsecured Senior Notes Due January 2021 [Member]	Jan. 21, 2011 Senior Notes [Member] Unsecured Senior Notes Due January 2021 [Member]	Feb. 28, 2011 Senior Notes [Member] Private Shelf Agreement [Member]	Feb. 28, 2013 Revolving Credit Facility [Member] Bank of America [Member] Line of Credit [Member]	Feb. 29, 2012 Revolving Credit Facility [Member] Bank of America [Member] Line of Credit [Member]	May 25, 2006 Revolving Credit Facility [Member] Bank of America [Member] Line of Credit [Member]	Mar. 27, 2013 Subsequent Event [Member] Revolving Credit Facility [Member] Bank of America [Member] Line of Credit [Member]	Mar. 27, 2013 Subsequent Event [Member] Revolving Credit Facility [Member] Bank Of America And Other Lenders [Member] Line of Credit [Member]	Mar. 27, 2013 Subsequent Event [Member] Revolving Credit Facility [Member] Bank Of America And Other Lenders [Member] Line of Credit [Member] Maximum [Member]	Mar. 27, 2013 Subsequent Event [Member] Revolving Credit Facility [Member] Bank Of America And Other Lenders [Member] Line of Credit [Member] Eurodollar [Member] Minimum [Member]	Mar. 27, 2013 Subsequent Event [Member] Revolving Credit Facility [Member] Bank Of America And Other Lenders [Member] Line of Credit [Member] Eurodollar [Member] Maximum [Member]	Mar. 27, 2013 Subsequent Event [Member] Line of Credit [Member] Bank Of America And Other Lenders [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 100,000,000			$ 125,000,000		$ 225,000,000				$ 75,000,000
Accordion feature														75,000,000
Basis spread												1.00%	2.00%
Commitment fees												0.20%	0.30%
Covenant, net worth minimum	116,900,000		116,900,000						230,000,000
Covenant, minimum retention of future income	50.00%		50.00%						50.00%
Covenant, maximum leverage ratio									3.25
Covenant, minimum fixed charge coverage ratio	2.0		2.0						1.75
Covenant, maximum capital expenditures									60,000,000
Capital expenditure covenant									50,000,000
Variable rate description											Eurodollar
Amount outstanding on line of credit						0	0
Letters of credit outstanding						13,900,000
Remaining borrowing capacity on line of credit						111,100,000
Debt instrument, face amount		$ 100,000,000		$ 125,000,000
Debt instrument, stated percentage		6.24%		5.42%
Covenant, minimum ratio of indebtedness to EBIDTA	3.25		3.25
Covenant, maximum percentage of priority indebtedness	10.00%		10.00%