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Subsequent Events (Narritive) (Details) (USD $) | 12 Months Ended
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Apr. 30, 2013
Line of credit, maximum borrowing capacity | $ 125,000,000
Subsequent Event [Member] |
Promissory note cancelled amount | 25,000,000
Series A 3.67% Senior Note Due 2028 [Member] | Subsequent Event [Member] |
Principal amount received | 150,000,000
Interest rate | 3.67%
Debt issuance date | Jun. 17, 2013
Series B 3.75% Senior Note Due 2028 [Member] | Subsequent Event [Member] |
Principal amount received | 50,000,000
Interest rate | 3.75%
Debt issuance date | Dec. 17, 2013
Line of Credit [Member] | Subsequent Event [Member] |
Line of credit, maximum borrowing capacity | $ 100,000,000

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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 3: 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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