Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 30, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,992	$ 2,608
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (shares)	47,478,557	46,955,163
Common stock, shares outstanding (shares)	47,478,557	46,955,163
Treasury stock (shares)	260,900	260,900