Fair Value of Financial Assets and Financial Liabilities	3 Months Ended
	Dec. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Financial Liabilities	FAIR VALUE OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES: Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Assets and liabilities recorded at fair value are classified based upon the level of judgment associated with the inputs used to measure their fair value. The hierarchical levels related to the subjectivity of the valuation inputs are defined as follows: • Level 1—inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets • Level 2—inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument • Level 3—inputs to the valuation methodology are unobservable and significant to the fair value measurement Recurring Fair Value Measurements The Company's financial instruments consist primarily of cash and cash equivalents, accounts receivable, accounts payable, borrowings and derivatives. Management believes that the carrying value of cash and cash equivalents, accounts receivable and accounts payable are representative of their respective fair values. In conjunction with the fair value measurement of the derivative instruments, the Company made an accounting policy election to measure the credit risk of its derivative instruments that are subject to master netting agreements on a net basis by counterparty portfolio, as the gross values would not be materially different. The fair value of the Company's debt at December 30, 2022 and September 30, 2022 was $8,054.2 million and $7,153.4 million, respectively. The carrying value of the Company's debt at December 30, 2022 and September 30, 2022 was $8,159.0 million and $7,410.9 million, respectively. The fair values were computed using market quotes, if available, or based on discounted cash flows using market interest rates as of the end of the respective periods. The inputs utilized in estimating the fair value of the Company's debt have been classified as Level 2 in the fair value hierarchy levels. As part of the Union Supply acquisition completed in fiscal 2022, the Company recorded a contingent consideration obligation based on the fair value of the expected payments. The Company performed a fair value assessment of the contingent consideration obligation based on the terms and conditions of the Union Supply purchase agreement, using internal models. The inputs utilized in estimating the fair value of the contingent consideration have been classified as Level 3 in the fair value hierarchy levels and are subject to risk and uncertainty. The calculation of fair value is dependent on several subjective factors including future earnings and profitability. If assumptions or estimates vary from what was expected, the fair value of the contingent consideration liability may materially change. The fair value of the contingent consideration liability, which was recorded as part of the acquisition, at both December 30, 2022 and September 30, 2022 was $40.2 million, respectively. As part of the Next Level acquisition completed in fiscal 2021, the Company recorded a contingent consideration obligation based on the fair value of the expected payments. The Company performed a fair value assessment of the contingent consideration obligation based on the terms and conditions of the Next Level purchase agreement, as amended, using internal models. The inputs utilized in estimating the fair value of the contingent consideration have been classified as Level 3 in the fair value hierarchy levels and are subject to risk and uncertainty. The calculation of fair value is dependent on several subjective factors including future earnings and profitability. If assumptions or estimates vary from what was expected, the fair value of the contingent consideration liability may materially change. The fair value of the contingent consideration liability at December 30, 2022 and September 30, 2022 was $18.4 million and $48.4 million, respectively. During the three months ended December 30, 2022, due to lower performance than expected from inflationary cost pressures and the reduced probability of a prospective business opportunity being awarded during the performance period, the Company adjusted the contingent consideration liability to the fair value of the future expected payment, resulting in income of $29.9 million, which is included in "Cost of services provided (exclusive of depreciation and amortization)" on the Condensed Consolidated Statements of Income.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.