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Long-Term Debt - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 16, 2019 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020 | Apr. 30, 2020
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  | $ 646,000,000.0 |  | $ 646,000,000.0
Standby Letters of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt arrangement |  |  | 4,000,000.0 |  | 4,000,000.0
Standby Letters of Credit | Other Financial Institutions |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt arrangement |  |  | $ 10,700,000 |  | 11,300,000
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% |  |  |  |
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 |  |  | $ 420,500,000 |  | 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 |  |  |  |
Redemption before December 15, 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of principal amount redeemable with equity offering proceeds | 35.00% |  |  |  |
Percentage of principal amount of debt redeemed | 104.625% |  |  |  |
Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement initiation date | Dec. 16, 2019 |  |  |  |
Average interest rate |  | 2.94% |  | 3.44% |
Unamortized debt issuance costs |  |  | $ 3,500,000 |  | 4,200,000
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 |  | $ 0
Credit Agreement | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Leverage ratio to be attained for payment of dividends | 4.00 |  |  |  |
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% |  |
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% |  |

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