Represents the number of alternative methods for the accrual of interest on borrowings under the credit facility.

No definition available.

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- Definition

Represents the amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the eight fiscal year following the latest fiscal year.

+ References

No definition available.

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- Definition

Represents the amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the seventh fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the sixth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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- Definition

The maximum amount of additional debt that can be incurred under debt covenants.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

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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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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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-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ Details

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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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Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

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Balance Type:	debit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Subparagraph (SX 210.9-03(16))
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Data Type:	xbrli:monetaryItemType
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.

+ References

+ 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

+ Details

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Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 210
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Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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-Subparagraph (SX 210.12-04.(a))
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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Balance Type:	credit
Period Type:	duration

- Details

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- Details

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- Details

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- Details

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Long-Term Debt - Schedule (Details)		3 Months Ended
Long-Term Debt - Schedule (Details)	Mar. 01, 2017 USD ($)	May 31, 2017 USD ($) item	May 31, 2016 USD ($)	Feb. 28, 2017 USD ($)
Long-term debt
Total long-term debt		$ 453,841,000		$ 485,615,000
Less current maturities of long-term debt		(20,601,000)		(24,404,000)
Long-term debt, excluding current maturities		433,240,000		461,211,000
Principal payment made		5,700,000	$ 3,800,000
Unsecured state industrial development loan
Long-term debt
Face amount		37,600,000
Total long-term debt		24,207,000		29,903,000
Principal payment made	$ 5,700,000
Outstanding principal payable on March 1, 2018		1,900,000
Outstanding principal payable on March 1, 2019		1,900,000
Outstanding principal payable on March 1, 2020		1,900,000
Outstanding principal payable on March 1, 2021		1,900,000
Outstanding principal payable on March 1, 2022		1,900,000
Outstanding principal payable on March 1, 2023		$ 14,800,000
Unsecured state industrial development loan \| Maximum \| Base Rate
Long-term debt
Margin (as a percent)		1.00%
Unsecured state industrial development loan \| Maximum \| LIBOR
Long-term debt
Margin (as a percent)		2.00%
3.90% unsecured Senior Notes payable
Long-term debt
Face amount		$ 100,000,000
Interest rate (as a percent)		3.90%
Fixed interest rate (as a percentage)		3.90%
Principal payment		$ 20,000,000
Total long-term debt		19,834,000		19,763,000
Credit Agreement
Long-term debt
Maximum revolving commitment		$ 1,000,000
Number of alternative methods under which interest on borrowings accrue \| item		2
Amount available for borrowings		$ 584,200,000
Maximum amount of additional debt that can be incurred under debt covenants		309,800,000
Total long-term debt		409,800,000		$ 435,949,000
Revolving loan \| Credit Agreement
Long-term debt
Amount outstanding		414,300,000
Letter of credit \| Credit Agreement
Long-term debt
Amount outstanding		$ 1,500,000