CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 28, 2019	Sep. 29, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 21,306	$ 12,626
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	500,000,000	151,458,824
Common stock, shares issued (in shares)	109,623,417	100,868,250
Common stock, shares outstanding (in shares)	108,602,642	100,061,210
Treasury stock, shares at cost (in shares)	1,020,775	807,040