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v3.20.2

Long-Term Debt - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 16, 2019 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
CSV of COLI Contracts |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding policy loans |  | $ 92,300,000 | $ 93,200,000 |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, remaining borrowing capacity |  | 646,000,000.0 | 420,200,000 |
Line of credit facility borrowings |  |  | 226,900,000 |
Standby Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt arrangement |  | 4,000,000.0 | 2,900,000 |
Standby Letters of Credit | Other Financial Institutions |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt arrangement |  | $ 11,300,000 | $ 8,500,000 |
Minimum | CSV of COLI Contracts |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Average interest rate |  | 4.76% |  |
Maximum | CSV of COLI Contracts |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Average interest rate |  | 8.00% |  |
4.625% Senior Unsecured Notes due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate | 4.625% |  |  |
Principal amount | $ 400,000,000 |  |  |
Debt instrument, unamortized discount | $ 4,500,000 |  |  |
Debt instrument, maturity date |  | Dec. 15, 2027 |  |
Debt instrument, interest rate terms |  | interest payable semi-annually in arrears on June 15 and December 15 of each year, commencing on June 15, 2020 |  |
Interest payment commencing date |  | Jun. 15, 2020 |  |
Redemption price, percentage | 100.00% |  |  |
Percentage of principal amount redeemable with equity offering proceeds | 35.00% |  |  |
Redemption price, percentage of principal amount redeemed | 104.625% |  |  |
Dividends payable per fiscal year | $ 25,000,000 |  |  |
Debt Instrument, change in control and rating decline, percentage of principal amount | 101.00% |  |  |
Debt instrument, proceeds from offering used to repay outstanding debt | $ 276,900,000 |  |  |
Interest rate, effective percentage | 4.86% |  |  |
Debt instrument, fair value |  | $ 372,500,000 |  |
4.625% Senior Unsecured Notes due 2027 | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Leverage ratio to be attained for payment of dividends | 3.50 |  |  |
Credit Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit agreement initiation date | Dec. 16, 2019 |  |  |
Average interest rate |  | 3.34% | 3.50% | 2.60%
Unamortized debt issuance costs |  | $ 4,200,000 | $ 4,000,000.0 |
Credit Agreement | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument term | 5 years |  |  |
Line of credit facility, maximum borrowing capacity | $ 650,000,000.0 |  |  |
Line of credit facility, maturity date |  | Dec. 16, 2024 |  |
Long-term debt |  | $ 0 | $ 226,900,000 |
Credit Agreement | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Pro forma liquidity | $ 50,000,000.0 |  |  |
Credit Agreement | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 1.125% |  |
Credit Agreement | Minimum | Base Rate Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 0.125% |  |
Credit Agreement | Minimum | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Quarterly commitment fee on average daily unused amount of Credit Facilities |  | 0.175% |  |
Credit Agreement | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Leverage ratio to be attained for payment of dividends | 4.25 |  |  |
Credit Agreement | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 2.00% |  |
Credit Agreement | Maximum | Base Rate Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 1.00% |  |
Credit Agreement | Maximum | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Quarterly commitment fee on average daily unused amount of Credit Facilities |  | 0.35% |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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