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Debt and Available Credit Facilities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Jul. 31, 2019 | May 30, 2019
Components of Total Debt Outstanding [Abstract] |  |  |  |  |
Short-term portion of long-term debt | [1] | $ 12,500 | $ 9,375 |  |
Total long-term debt, less current portion |  | 809,088 | 765,650 |  |
Total debt |  | 821,588 | 775,025 |  |
Unamortized issuance costs |  | 500 | 700 |  |
Annual Maturities of Long-term Debt, Including Short-term Portion [Abstract] |  |  |  |  |
2022 |  | 12,500 |  |  |
2023 |  | 18,750 |  |  |
2024 |  | 204,688 |  |  |
2025 |  | 586,160 |  |  |
Total |  | $ 822,098 |  |  |
Amended and Restated RCA [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Term of credit facility |  | 5 years |  |  |
Costs incurred |  |  |  | $ 4,000 |
Credit agreement issuance cost capitalized |  |  |  | 5,200 |
Amortization expense of the lender and non-lender fees in interest expense |  | $ 1,100 | 1,000 |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Term of credit facility |  | 5 years |  |  |
Revolving Credit Facility [Member] | Amended and Restated RCA [Member] |  |  |  |  |
Components of Total Debt Outstanding [Abstract] |  |  |  |  |
Total long-term debt, less current portion |  | $ 586,160 | $ 530,387 |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Amount of financing available under credit facilities |  |  |  |  | $ 1,250,000
Credit agreement issuance cost capitalized |  |  |  | 4,300 |
Line of Credit [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Amount of financing available under credit facilities |  | 1,500,000 |  |  |
Unused lines of credit |  | $ 700,000 |  |  |
Weighted average interest rate on total debt outstanding during the period |  | 2.03% | 3.12% |  |
Weighted average interest rate on total debt at period end |  | 1.98% | 2.26% |  |
Term Loan A Facility [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Term of credit facility |  | 5 years |  |  |
Term Loan A Facility [Member] | Amended and Restated RCA [Member] |  |  |  |  |
Components of Total Debt Outstanding [Abstract] |  |  |  |  |
Total long-term debt, less current portion | [2] | $ 222,928 | $ 235,263 |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Credit agreement face amount |  |  |  |  | $ 250,000
Credit agreement issuance cost capitalized |  |  |  | 900 |
Term Loan amount related to lender fees as a reduction to debt |  |  |  | 800 |
Term Loan amount related to non-lender fees in Other NC Assets |  |  |  | $ 100 |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Optional credit limit increase available on request |  | 500,000 |  |  |
Minimum increments in which optional credit limit increase may be requested |  | $ 50,000 |  |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Minimum [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Line of credit facility fee percentage |  | 0.15% |  |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Maximum [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Line of credit facility fee percentage |  | 0.25% |  |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | LIBOR [Member] | Minimum [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Applicable margin |  | 0.98% |  |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | LIBOR [Member] | Maximum [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Applicable margin |  | 1.50% |  |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Applicable margin |  | 0.00% |  |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Applicable margin |  | 0.50% |  |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Federal Funds Effective Rate [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Margin rate over reference rate used in determining base rate |  | 0.50% |  |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Eurocurrency Rate [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Margin rate over reference rate used in determining base rate |  | 1.00% |  |  |
Other Credit Facilities [Member] | Line of Credit [Member] |  |  |  |  |
Debt and Available Credit Facilities [Abstract] |  |  |  |  |
Outstanding borrowings under revolving credit facilities |  | $ 0 | $ 0 |  |
Amount of financing available under credit facilities |  | $ 1,000 |  |  |
[1] | Relates to our term loan A under the Amended and Restated RCA.
[2] | Amounts are shown net of unamortized issuance costs of $0.5 million as of April 30, 2021 and $0.7 million as of April 30, 2020.

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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=123466204&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=120400017&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=120391452&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=120398452&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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=120398452&loc=d3e534808-122878 Reference 3: 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=120400017&loc=d3e572229-122910 + Details
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