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Commitments and Contingencies (Tables) | 9 Months Ended
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Feb. 29, 2016
Line of Credit [Member] |
Line of Credit Facility [Line Items] |
Line of credit facility | As of February 29, 2016, the Company had unused borrowing capacity available under four uncommitted, secured, short-term lines of credit at market rates of interest with financial institutions as follows:
Financial institution | Amount available |  | Expiration date
JP Morgan Chase Bank, N.A. | $350 million |  | February 27, 2017
Bank of America, N.A. | $250 million |  | February 28, 2017
PNC Bank, National Association | $150 million |  | February 27, 2017
Wells Fargo Bank, National Association | $150 million |  | February 27, 2017
Revolving Credit Facility [Member] |
Line of Credit Facility [Line Items] |
Line of credit facility | During the nine months ended February 29, 2016 and February 28, 2015, the Company borrowed against this facility, and its predecessor facility, one or two times during a quarter overnight as follows:
|  |  | For the nine months ended
$ in millions |  |  | February 29, 2016 |  | February 28, 2015
Maximum amount borrowed |  |  | $ | 350.0 |  |  | $ | 150.0 |
Average amount borrowed |  |  | $ | 217.0 |  |  | $ | 125.0 |
Weighted-average interest rate |  |  | 3.25 | % |  | 3.25 | %

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to 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. + 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 FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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