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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 27, 2019	Sep. 28, 2018
Statement of Financial Position [Abstract]
Allowances for accounts receivable	$ 5,047	$ 6,795
Preferred stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	300,000,000	300,000,000
Common stock, issued (in shares)	66,177,000	65,202,000
Common stock, outstanding (in shares)	66,154,000	65,179,000
Common stock, subject to forfeiture (in shares)	0	6,100
Treasury stock (in shares)	23,000	23,000

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