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Revolving Credit Agreement (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Mar. 31, 2012
Line of Credit Facility [Line Items] |
Line of credit facility, maximum borrowing capacity | $ 350
Revolving Credit Agreement, expiration date | June 21, 2016
Interest on the borrowings, variable rates | 0.20%
Letters of credit issued | 5.9
Revolving credit available for future borrowings | $ 344.1
Interest coverage ratio | 3.5
Debt to capital ratio | 55.00%
Maximum [Member] |
Line of Credit Facility [Line Items] |
Credit facility, fees rate | 0.45%
Minimum [Member] |
Line of Credit Facility [Line Items] |
Credit facility, fees rate | 0.10%
Base Rate [Member] |
Line of Credit Facility [Line Items] |
Interest on the borrowings, variable rates | 0.00%
Base Rate [Member] | Maximum [Member] |
Line of Credit Facility [Line Items] |
Interest on the borrowings, variable rates | 0.95%
Base Rate [Member] | Minimum [Member] |
Line of Credit Facility [Line Items] |
Interest on the borrowings, variable rates | 0.00%
LIBOR [Member] |
Line of Credit Facility [Line Items] |
Interest on the borrowings, variable rates | 1.20%
LIBOR [Member] | Maximum [Member] |
Line of Credit Facility [Line Items] |
Interest on the borrowings, variable rates | 1.95%
LIBOR [Member] | Minimum [Member] |
Line of Credit Facility [Line Items] |
Interest on the borrowings, variable rates | 0.65%
Letters Of Credit [Member] |
Line of Credit Facility [Line Items] |
Interest on the borrowings, variable rates | 1.20%
Letters Of Credit [Member] | Maximum [Member] |
Line of Credit Facility [Line Items] |
Credit facility, fees rate | 1.95%
Letters Of Credit [Member] | Minimum [Member] |
Line of Credit Facility [Line Items] |
Credit facility, fees rate | 0.65%

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- Definition Interest Coverage Ratio + References No definition available. + Details
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- Definition Ratio of Debt to Capital + References No definition available. + Details
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- 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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- 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

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- 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 Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter). + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: 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 + Details
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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: 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 + Details
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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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