Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 92,647	$ 124,120	$ 79,730
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	50,828	47,199	42,719
Amortization of deferred financing costs	1,832	1,748	1,361
Stock-based compensation	14,662	11,602	11,115
Excess tax benefits from stock-based awards	0	0	(19,946)
Deferred income taxes	6,659	(4,833)	10,789
Gain on sale of property and equipment	0	0	(2,050)
Loss on disposal of property, plant and equipment	730	273	65
Other	(570)	1,840	3,999
Changes in assets and liabilities (excluding businesses acquired):
Receivables	1,485	(28,741)	(32,419)
Inventories	(3,696)	(15,087)	(15,885)
Prepaid expenses and other assets	(2,643)	(3,803)	2,845
Accounts payable	30,473	(1,163)	(2,143)
Accrued expenses	12,261	(20,096)	35,018
Other long-term obligations	306	1,053	(889)
Net cash provided by operating activities	204,974	114,112	114,309
Cash flows from investing activities:
Additions to property, plant and equipment	(31,577)	(37,845)	(44,659)
Businesses acquired, net of cash acquired	(41,161)	(91,244)	(103,880)
Escrow deposit for acquisition-related contingent consideration	0	0	(6,000)
Proceeds from asset sales	0	0	8,547
Payments for investments	(2,010)	(9,048)	(12,495)
Other investing activities	(1,515)	(2,745)	(4,355)
Net cash used in investing activities	(76,263)	(140,882)	(162,842)
Cash flows from financing activities:
Repayments on revolving line of credit	0	(23,000)	(552,000)
Borrowings on revolving line of credit	0	23,000	552,000
Repayments of long-term debt	(46,193)	(431)	(463)
Issuance of long-term debt	0	300,000	0
Proceeds from issuance of common stock, net of offering costs	0	195,631	0
Excess tax benefits from stock-based awards	0	0	19,946
Repurchase of common stock, including shares surrendered for tax withholding	(62,974)	(13,797)	(27,556)
Payments of contingent consideration	(170)	(253)	(1,300)
Distribution to noncontrolling interest	(76)	(1,597)	(1,019)
Payment of financing costs	(1,352)	(4,770)	0
Net cash (used in) provided by financing activities	(110,765)	474,783	(10,392)
Effect of exchange rate changes on cash and cash equivalents	(250)	(50)	75
Net increase (decrease) in cash, cash equivalents and restricted cash	17,696	447,963	(58,850)
Cash, cash equivalents and restricted cash at beginning of year	493,005	45,042	103,892
Cash, cash equivalents and restricted cash at end of year	510,701	493,005	45,042
Supplemental information:
Cash paid for interest	42,702	36,664	27,878
Cash paid for income taxes – net of refunds	14,958	19,508	10,560
Non-cash investing and financing activities:
Capital expenditures incurred but not paid	2,630	2,386	3,106
Liability for contingent performance-based payments	(685)	(2,888)	2,830
Shares of common stock repurchased but not settled	$ 458	$ 0	$ 0