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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 29, 2018
Sep. 30, 2017
Statement of Financial Position [Abstract]    
Redeemable convertible preferred stock, par value (in dollars per share)   $ 0.001
Redeemable convertible preferred stock, liquidation preference   $ 90,976
Redeemable convertible preferred stock, shares authorized (in shares) 10,000,000 32,675,074
Redeemable convertible preferred stock, shares issued (in shares) 0 32,482,590
Redeemable convertible preferred stock, shares outstanding (in shares) 0 32,482,590
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) 100,868,250 59,339,336
Common stock, shares outstanding (in shares) 100,061,210 58,592,874
Treasury stock, shares at cost (in shares) 807,040 746,462