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Commitments and Contingencies (Details Textual) (USD $) |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2014 | May 31, 2013 | Feb. 28, 2014 Line of Credit [Member] | Feb. 28, 2014 Revolving Credit Facility [Member] | Nov. 30, 2013 Revolving Credit Facility [Member] | Aug. 31, 2013 Revolving Credit Facility [Member] | Feb. 28, 2014 Revolving Credit Facility [Member] | Feb. 28, 2014 Standby Letters of Credit [Member] | May 31, 2013 Standby Letters of Credit [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount outstanding during period |  |  |  | $ 0 | $ 175,000,000 | $ 25,000,000 |  |  |
Interest rate on amount borrowed |  |  |  |  | 3.25% | 3.25% |  |  |
Maximum borrowing capacity |  |  |  | 500,000,000 |  |  | 500,000,000 |  |
Expiration date |  |  |  |  |  |  | Jun. 21, 2018 |  |
Amount outstanding |  |  | 0 | 0 |  |  | 0 |  |
Amount available |  |  |  |  |  |  |  | 43,000,000 | 36,800,000
Expiration date range of letters of credit |  |  |  |  |  |  |  | July 2014 and April 2015 |
Irrevocable stand by letters of credit amount outstanding |  |  |  |  |  |  |  | 0 |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |
Commitments to purchase capital assets | $ 7,700,000 | $ 9,900,000 |  |  |  |  |  |  |

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- 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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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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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