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.

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

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

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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.

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No definition available.

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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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-Paragraph 1A
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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.

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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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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
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-SubTopic 10
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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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.

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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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-Publisher FASB
-Name Accounting Standards Codification
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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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- 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		6 Months Ended
	Jul. 28, 2017	Jun. 30, 2017	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Debt And Receivables Securitization [Line Items]
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)			$ 2,114,000	$ 7,317,000	$ 8,912,000	$ 8,050,000
Remaining borrowing capacity			485,505,000		$ 485,505,000
Senior Unsecured Notes 4.300% 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		194,000		$ 194,000
Debt issuance cost	$ 2,116,000
Unamortized portion of debt issuance costs			2,069,000		2,069,000
Senior Unsecured Notes 4.300% 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		$ 100,000,000
Maturity date					2018-01
Borrowings outstanding			0		$ 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		$ 500,000,000
Maturity date					2020-04
Borrowings outstanding			0		$ 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			15,877,000		$ 15,877,000
Drawn amount of letter of credit outstanding					0
Letter of Credit
Debt And Receivables Securitization [Line Items]
Letter of credit amount outstanding			$ 14,495,000		$ 14,495,000