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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Apr. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax
Changes in Accumulated other comprehensive loss by component, net of tax, for the years ended April 30, 2023, 2022, and 2021 were as follows:
Foreign
Currency
Translation 		Unamortized
Retirement
Costs 		Interest
Rate Swaps 		Total
Balance at April 30, 2020$(340,703)$(227,920)$(6,874)$(575,497)
Other comprehensive income (loss) before reclassifications82,762 (6,273)(639)75,850 
Amounts reclassified from Accumulated other comprehensive loss— 6,047 2,810 8,857 
Total other comprehensive income (loss)82,762 (226)2,171 84,707 
Balance at April 30, 2021$(257,941)$(228,146)$(4,703)$(490,790)
Other comprehensive (loss) income before reclassifications(71,625)40,247 5,165 (26,213)
Amounts reclassified from Accumulated other comprehensive loss— 5,673 3,184 8,857 
Total other comprehensive (loss) income(71,625)45,920 8,349 (17,356)
Balance at April 30, 2022$(329,566)$(182,226)$3,646 $(508,146)
Other comprehensive income (loss) before reclassifications3,220 (29,053)4,385 (21,448)
Amounts reclassified from Accumulated other comprehensive loss— 4,473 (3,781)692 
Total other comprehensive income (loss)3,220 (24,580)604 (20,756)
Balance at April 30, 2023$(326,346)$(206,806)$4,250 $(528,902)