Borrowings - Summary of Borrowings (Details) $ in Thousands		12 Months Ended
		Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Nov. 07, 2016
Debt Instrument [Line Items]
Short-term Debt		$ 5,072	$ 5,078
2019		9,744
2020		9,721
2021		9,704
2022		9,694
2023		9,539
Thereafter		393,238
Total		441,640
Euro term loan
Debt Instrument [Line Items]
Debt issuance cost for long term portion of the Euro term loan		11,200	20,400
Revolving line of credit
Debt Instrument [Line Items]
Interest rate of term loan				0.013
Interest rate				0.01
Euro term loan
Debt Instrument [Line Items]
Debt issuance cost for short term portion of the Euro term loan		4,700	4,700
Current portion of long-term obligations
Debt Instrument [Line Items]
Euro Term Loan due current portion	[1]	3,092	3,230
1.3% Term Loan due 2024		1,448	1,477
1.0% State of Connecticut Term Loan due 2023		374	371
O.R. Laser loans		158	0
Long-term debt
Debt Instrument [Line Items]
Euro Term Loan due 2024	[2]	411,661	578,356
1.3% Term Loan due 2024		7,242	8,865
1.0% State of Connecticut Term Loan due 2023		1,406	1,780
O.R. Laser loans		402	0
Long-term Debt		$ 420,711	$ 589,001

[1] (1) Net of debt issuance costs of $4.7 million and $4.7 million at September 29, 2018 and September 30, 2017, respectively.

[2] (1) Net of debt issuance costs of $11.2 million and $20.4 million at September 29, 2018 and September 30, 2017, respectively.