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Deferred Compensation and Retirement Plans (Tables) | 6 Months Ended
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Oct. 31, 2021
Compensation And Retirement Disclosure [Abstract] |
Components of Net Periodic Benefits Costs | The components of net periodic benefit costs are as follows:
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | (in thousands) |
Service cost |  | $ | 9,749 |  |  | $ | 8,197 |  |  | $ | 18,428 |  |  | $ | 15,480 |
Interest cost |  |  | 1,038 |  |  |  | 1,047 |  |  |  | 2,057 |  |  |  | 2,080 |
Amortization of actuarial loss |  |  | 542 |  |  |  | 996 |  |  |  | 1,085 |  |  |  | 1,993 |
Expected return on plan assets (1) |  |  | (386 | ) |  |  | (351 | ) |  |  | (773 | ) |  |  | (702 | )
Net periodic service credit amortization |  |  | (102 | ) |  |  | (102 | ) |  |  | (203 | ) |  |  | (203 | )
Net periodic benefit costs (2) |  | $ | 10,841 |  |  | $ | 9,787 |  |  | $ | 20,594 |  |  | $ | 18,648 |
(1) | The expected long-term rate of return on plan assets was 6.00% and 6.00% for October 31, 2021 and 2020, respectively.
(2) | The service cost, interest cost and the other components of net periodic benefit costs are included in compensation and benefits expense, interest expense, net and other income, net, respectively, on the consolidated statements of operations.

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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