Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 04, 2020	Sep. 28, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 4,387	$ 1,537
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	53,442,000	52,917,000
Common stock, shares outstanding (in shares)	29,214,000	29,004,000
Treasury stock, shares (in shares)	24,228,000	23,913,000