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Long-term Debt and Fair Value Disclosure (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2019 | Apr. 30, 2019
Debt Instrument |  |
Fair value of long-term debt | $ 1,323,000,000 | $ 1,272,000,000
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility |  |
Debt Instrument |  |
Maximum borrowing capacity | 300,000,000 |
Fair value of amount outstanding | 50,000,000 | 75,000,000
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility | Letter of Credit |  |
Debt Instrument |  |
Maximum borrowing capacity | 30,000,000 |
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility | Swingline Loans |  |
Debt Instrument |  |
Maximum borrowing capacity | $ 30,000,000 |
Unsecured Revolving Credit Facility Due January 2024 | Minimum | Revolving Credit Facility |  |
Debt Instrument |  |
Facility fee percentage | 0.20% |
Unsecured Revolving Credit Facility Due January 2024 | Maximum | Revolving Credit Facility |  |
Debt Instrument |  |
Facility fee percentage | 0.40% |
Unsecured Revolving Line of Credit | Line of Credit |  |
Debt Instrument |  |
Maximum borrowing capacity | $ 25,000,000 |
Fair value of amount outstanding | $ 0 | $ 0

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- Definition Line Of Credit Facility, Facility Fee Percentage + 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 Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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