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Fair Value of Financial Instruments and Long Term Debt (Details) | 12 Months Ended
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Apr. 30, 2016 USD ($) note | Apr. 30, 2015 USD ($) | Apr. 30, 2014 USD ($)
Debt Instrument |  |  |
Long-term debt and capital lease obligations | $ 887,000,000 | $ 887,000,000 |
Number of promissory notes | note | 2 |  |
Amount outstanding at period end | $ 0 | 0 |
Interest income | 157,000 | 158,000 | $ 214,000
Capitalized interest | 1,134,000 | 1,209,000 | $ 1,177,000
Note1 And Note 2 |  |  |
Debt Instrument |  |  |
Maximum borrowing capacity |  | $ 100,000,000 |
Note 1 |  |  |
Debt Instrument |  |  |
Principal amount of each note | $ 50,000,000 |  |
Interest over variable Index | 0.75% |  |
Note 2 |  |  |
Debt Instrument |  |  |
Principal amount of each note | $ 50,000,000 |  |
Interest over variable Index | 1.00% |  |

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- Definition Debt Instrument Carrying Amount Of Each Note + References No definition available. + Details
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- Definition Interest Over Index + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number of notes. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition The net amount of operating interest income (expense). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.10) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + 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 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 The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Current portion of the total carrying amount as of the balance sheet date due within one year or the operating cycle, if longer, on all notes payable to banks paid on an installment with long term maturities. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances. + 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(a)(1),20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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