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Accumulated Other Comprehensive (Loss) Income - Components of and Changes in AOCL (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive (Loss) Income $ (330,327) $ (417,242)  
Other comprehensive (loss) income, net of tax 88,844 (46,158) $ (53,755)
Post-retirement Benefit Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive (Loss) Income (213,172) (232,634) (222,270)
Other comprehensive loss before reclassifications 9,107 (18,299) (39,639)
Amounts reclassified from accumulated other comprehensive loss 10,355 7,935 5,124
Net current period other comprehensive loss 19,462 (10,364) (34,515)
Derivatives [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive (Loss) Income 5,273 (3,581) (3,678)
Other comprehensive loss before reclassifications 9,255 (582) 197
Amounts reclassified from accumulated other comprehensive loss (401) 679 1,348
Net current period other comprehensive loss 8,854 97 1,545
AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive (Loss) Income (330,327) (417,242) (373,543)
Other comprehensive loss before reclassifications 76,961 (52,313) (59,690)
Other comprehensive (loss) income, net of tax 86,915 (43,699) (53,218)
Amounts reclassified from accumulated other comprehensive loss 9,954 8,614 6,472
Net current period other comprehensive loss 86,915 (43,699) (53,218)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive (Loss) Income (3,982) (5,909) (3,450)
Other comprehensive loss before reclassifications 1,927 (2,459) (537)
Other comprehensive (loss) income, net of tax 1,927 (2,459) (537)
AOCI Attributable to Noncontrolling Interest [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive (Loss) Income (3,982) (5,909) (3,450)
Other comprehensive loss before reclassifications 1,927 (2,459) (537)
Other comprehensive (loss) income, net of tax 1,927 (2,459) (537)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Swap [Member] | Derivatives [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Interest Income (Expense), Net $ 4,082 $ 2,444 $ 2,352