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Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 27, 2019	Sep. 28, 2018
Other Liabilities Disclosure [Abstract]
Compensation and benefits	$ 20,455	$ 22,935
Distribution costs	7,797	10,670
Product warranty	3,273	5,756
Restructuring costs	2,527	89
Professional fees	1,554	1,875
Rent and utilities	701	1,660
Income taxes payable	1,233	415
Contingent consideration	0	585
Purchase price holdback	0	375
Other	2,368	5,585
Total	$ 39,908	$ 49,945

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