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Long-Term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2014 | Apr. 30, 2014 | Oct. 31, 2014 New Hampshire Bonds [Member] | Oct. 31, 2014 Revenue Bonds Series 2013 Due 2029 [Member] | Apr. 30, 2014 Revenue Bonds Series 2013 Due 2029 [Member]
Debt Instrument [Line Items] |  |  |  |  |
Additional bond issued |  |  | $ 5,500 |  |
Debt instrument amount outstanding | $ 523,778 | $ 508,019 | $ 11,000 | $ 5,500 | $ 5,500

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Details
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- Definition The cash inflow from the issuance of long-term tax exempt debt that is not secured by collateral. + References No definition available. + Details
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