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Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) - Pension Benefits - USD ($) $ in Thousands	Aug. 31, 2021	Aug. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	$ 993,124	$ 976,542
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	11,383	57,801
Equity Securities: Common/collective trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	180,766	219,050
Fixed Income Securities: Common/collective trust [Member] [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	707,831	603,250
Partnership and joint venture interests
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	93,144	94,400
Other assets
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value		2,041
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 3 | Other assets
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value		0
Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	11,383	57,801
Fair Value, Inputs, Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	11,383	57,801
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 1 | Other assets
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value		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
Fair Value, Inputs, Level 2 | Other assets
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value		$ 0

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Name Accounting Standards Codification
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