Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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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
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- Definition

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

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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- Definition

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

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No definition available.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Subparagraph (SX 210.5-02(22))
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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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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- Definition

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

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 15
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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Amounts drawn against outstanding letters of credit.

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No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

Change Of Control Debt Redemption Price Percent Of Principal Amount

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Debt And Receivables Securitization [Line Items]

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Debt Instrument, Yield to Maturity

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Line of Credit Maturity Month and Year

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Trade Accounts Receivables Past Due Excluded From Securitization Period

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Debt and Receivables Securitization - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended
	Jul. 28, 2017	Jun. 30, 2017	Aug. 31, 2017	Aug. 31, 2016
Debt And Receivables Securitization [Line Items]
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)			$ 6,798,000	$ 733,000
Remaining borrowing capacity			$ 485,950,000
Senior Unsecured Notes 4.30% due August 1, 2032
Debt And Receivables Securitization [Line Items]
Principal amount	$ 200,000,000
Debt, maturity date			Aug. 01, 2032
Debt, interest rate	4.30%
Percentage of principal amount debt instrument was sold to the public	99.901%
Yield to maturity	4.309%
Debt discount	$ 198,000		$ 197,000
Debt issuance cost	$ 2,114,000
Unamortized portion of debt issuance costs			2,103,000
Senior Unsecured Notes 4.30% due August 1, 2032 \| Interest Rate Swap
Debt And Receivables Securitization [Line Items]
Notional Amount		$ 150,000,000
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)		$ 3,098,000
Securities Sold under Agreements to Repurchase
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity			$ 100,000,000
Maturity date			2018-01
Borrowings outstanding			$ 0
Number of days past due trade accounts receivables are ineligible for securitization			90 days
Unsecured Revolving Credit Facility
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity			$ 500,000,000
Maturity date			2020-04
Borrowings outstanding			$ 0
Unsecured Revolving Credit Facility \| Maximum
Debt And Receivables Securitization [Line Items]
Debt maturity period			1 year
Stand-by Letters of Credit
Debt And Receivables Securitization [Line Items]
Letter of credit amount outstanding			$ 15,662,000
Drawn amount of letter of credit outstanding			0
Letter of Credit
Debt And Receivables Securitization [Line Items]
Letter of credit amount outstanding			$ 14,050,000