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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Prior service cost included in accumulated other comprehensive loss	$ 0.6
Prior service cost included in accumulated other comprehensive loss, net of tax	0.4
Unrecognized net actuarial losses included in accumulated other comprehensive loss	0.2
Unrecognized net actuarial losses included in accumulated other comprehensive loss, net of tax	0.2
Defined benefit plan, expected future employer contributions, next fiscal year	$ 10.0
Multi-Employer Pension Plans
Multiemployer plans, collective-bargaining arrangement, expiration date	May 01, 2022
Maximum Percent of Total Plan Contributions Contributed to Multi-employer Plan	5.00%	5.00%	5.00%
Multiemployer plan period contributions	$ 1.4	$ 1.5	$ 1.4
401(k) plans
Amounts expensed (income recognized) for matching and discretionary contributions	45.5	39.5	43.3
Supplemental Executive Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Trust held assets	21.3
Defined contribution SERP expense	$ 2.6	$ 1.6	$ 1.6
Minimum
401(k) plans
Percentage contribution by employees for defined contribution 401(k) plans, low end of range (as a percent)	2.00%
Employer contribution	2.00%
Maximum
401(k) plans
Percentage contribution by employees for defined contribution 401(k) plans, low end of range (as a percent)	100.00%
Employer contribution	6.00%

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- Definition

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of the net periodic benefit cost over the next fiscal year that follows the most recent annual statement of the financial position presented, net of tax.

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The amounts in accumulated other comprehensive income related to the prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of the financial position presented, net of tax.

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Defined contribution SERP expense.

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Maximum percent of plan contributions contributed to multi-employer plan.

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Multi employer pension plans.

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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

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Amount of cost for defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

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Expiration date of collective-bargaining arrangement (CBA) requiring contribution to multiemployer pension plan determined to be individually significant, in YYYY-MM-DD format.

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