Commitments and Contingencies - Additional Information (Detail) $ in Thousands	3 Months Ended	11 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($)	Oct. 02, 2015 USD ($)	Sep. 29, 2017 USD ($) Person	Sep. 30, 2016 USD ($)	Oct. 02, 2015 USD ($)	[1]	Mar. 31, 2014 USD ($)
Contingent Liabilities [Line Items]
Rental expense for operating leases for engineering, selling, administrative and manufacturing		$ 18,600	$ 17,700	$ 19,000
Total penalty proposed by DTCC Office of Compliance							$ 20,000
Penalty suspended and eligible for offset credit							$ 10,000
Penalty suspended and approved for offset credit			10,000
Gain on release of non-income tax liability		15,656	0	0	$ 15,656
Reduction in interest expense		2,400
Insurance recovery received	$ 5,000	0	$ 7,789	$ 5,000	$ 0
Belgium-based | Barco N V
Contingent Liabilities [Line Items]
Foreign currency exchange loss		$ (2,900)
US
Contingent Liabilities [Line Items]
Number of employees represented by various labor union | Person			586
Percentage of employees represented by labor unions			12.00%

[1] (Recast)