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Fair Value of Financial Instruments and Long Term Debt (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2019 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017 | Dec. 31, 2018
Debt Instrument |  |  |  |  |
Long-term debt and capital lease obligations |  | $ 1,272,000,000 | $ 1,277,000,000 |  |
Interest income |  | 595,000 | 1,583,000 | $ 588,000 |
Capitalized interest |  | $ 3,057,000 | $ 2,260,000 | $ 1,470,000 |
Promissory Note |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest over variable Index |  | 1.00% |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Maximum borrowing capacity | $ 300,000,000 |  |  |  |
Fair value of amount outstanding |  | $ 75,000,000 |  |  |
Line of Credit | Bank Line |  |  |  |  |
Debt Instrument |  |  |  |  |
Maximum borrowing capacity | 25,000 |  |  |  | $ 150,000
Fair value of amount outstanding |  | $ 0 |  |  |
Letter of Credit | Revolving Credit Facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Maximum borrowing capacity | 30,000,000 |  |  |  |
Bridge Loan | Revolving Credit Facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Maximum borrowing capacity | $ 30,000,000 |  |  |  |
Minimum | Line of Credit | Revolving Credit Facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Facility fee percentage | 0.20% |  |  |  |
Maximum | Line of Credit | Revolving Credit Facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Facility fee percentage | 0.40% |  |  |  |

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 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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