Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) - Pension Benefits - USD ($) $ in Thousands	Aug. 31, 2022	Aug. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	$ 787,422	$ 993,124
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	7,472	11,383
Equity Securities: Common/collective trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	142,730	180,766
Fixed Income Securities: Common/collective trust [Member] [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	550,046	707,831
Partnership and joint venture interests
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	87,174	93,144
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 3 | Equity Securities: Common/collective trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 3 | Fixed Income Securities: Common/collective trust [Member] [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 3 | Partnership and joint venture interests
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	7,472	11,383
Fair Value, Inputs, Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	7,472	11,383
Fair Value, Inputs, Level 1 | Equity Securities: Common/collective trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 1 | Fixed Income Securities: Common/collective trust [Member] [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 1 | Partnership and joint venture interests
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 2 | Equity Securities: Common/collective trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 2 | Fixed Income Securities: Common/collective trust [Member] [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Fair Value, Inputs, Level 2 | Partnership and joint venture interests
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	$ 0	$ 0