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Pension and Other Postretirement Benefits - Hierarchy of Fair Value of the Benefit Plan Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	$ 825,869	$ 792,758
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	78,336	87,259
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	631,543	570,137
NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	115,990	135,362
Corporate Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	407,008	350,394
Corporate Fixed Income Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	407,008	350,394
Value Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	66,950	74,070
Growth Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	38,119	49,438
Balanced Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	10,921	11,854
Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	74,448	83,361
Common Stock [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	74,448	83,361
US Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	61,770	62,381
US Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	61,770	62,381
Foreign Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	48,011	46,286
Foreign Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	48,011	46,286
Other Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	32,971	31,630
Other Fixed Income Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	32,971	31,630
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	85,671	83,344
Other [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	3,888	3,898
Other [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	$ 81,783	$ 79,446

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+ References

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