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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2026 | Apr. 30, 2025 | Apr. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | $ 752,206 | $ 739,716 | $ 1,045,027
Other comprehensive (loss) income before reclassifications | 29,279 | 23,770 | 3,880
Amounts reclassified from Accumulated other comprehensive loss | 7,423 | 25,749 | (3,417)
Total other comprehensive income | 36,702 | 49,519 | 463
Balance, end of year | 848,242 | 752,206 | 739,716
Accumulated other comprehensive loss, net of tax |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | (478,920) | (528,439) | (528,902)
Balance, end of year | (442,218) | (478,920) | (528,439)
Foreign Currency Translation |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | (264,548) | (333,827) | (326,346)
Other comprehensive (loss) income before reclassifications | 14,827 | 46,052 | (7,481)
Amounts reclassified from Accumulated other comprehensive loss | 1,001 | 23,227 | 0
Total other comprehensive income | 15,828 | 69,279 | (7,481)
Balance, end of year | (248,720) | (264,548) | (333,827)
Unamortized Retirement Costs |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | (209,190) | (200,922) | (206,806)
Other comprehensive (loss) income before reclassifications | 11,815 | (14,370) | (37)
Amounts reclassified from Accumulated other comprehensive loss | 7,049 | 6,102 | 5,921
Total other comprehensive income | 18,864 | (8,268) | 5,884
Balance, end of year | (190,326) | (209,190) | (200,922)
Interest Rate Swaps |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | (5,182) | 6,310 | 4,250
Other comprehensive (loss) income before reclassifications | 2,637 | (7,912) | 11,398
Amounts reclassified from Accumulated other comprehensive loss | (627) | (3,580) | (9,338)
Total other comprehensive income | 2,010 | (11,492) | 2,060
Balance, end of year | $ (3,172) | $ (5,182) | $ 6,310

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