Accounting Policies - Additional Information (Detail) $ in Thousands, € in Millions		1 Months Ended	3 Months Ended		12 Months Ended
		Apr. 30, 2015 EUR (€)	Dec. 28, 2018 USD ($)	Sep. 28, 2018 USD ($)	Sep. 28, 2018 USD ($) shares	Sep. 29, 2017 USD ($) shares	Sep. 30, 2016 USD ($) shares
Accounting Policies [Line Items]
Fair market value of long-term debt and short-term borrowings				$ 685,300	$ 685,300	$ 794,900
Maturities of forecasted transactions using forward exchange contracts					24 months
Accumulated loss on foreign currency translation adjustment				261,117	$ 261,117	222,621	$ 268,800
Gain (loss) on foreign currency transactions					(8,300)	11,900	19,800
Depreciation expense					57,400	58,200	49,500
Assets under capital leases				47,500	$ 47,500	$ 50,500	$ 48,200
Anti-dilutive shares excluded from computation of earnings per share | shares					773,624	637,800	602,900
Weighted average number of shares outstanding used to compute basic earnings per share | shares					29,598,000	29,767,000	29,490,000
Weighted average number of shares outstanding used to compute diluted earnings per share | shares					29,734,000	30,003,000	29,764,000
Reclassification of AOCI to retained earnings net tax benefit				7,700	$ (7,682)	$ 0	$ 0
New Guidance | Early Adoption | Scenario, Forecast
Accounting Policies [Line Items]
Cumulative effect of increase in retained earnings	[1]		$ 6,000
Minimum
Accounting Policies [Line Items]
Estimated amortization of intangible assets					2 years
Minimum | Building
Accounting Policies [Line Items]
Estimated useful lives of property, plant and equipment					15 years
Minimum | Machinery and Equipment
Accounting Policies [Line Items]
Estimated useful lives of property, plant and equipment					3 years
Maximum
Accounting Policies [Line Items]
Estimated amortization of intangible assets					20 years
Maximum | Building
Accounting Policies [Line Items]
Estimated useful lives of property, plant and equipment					30 years
Maximum | Machinery and Equipment
Accounting Policies [Line Items]
Estimated useful lives of property, plant and equipment					10 years
3.625% Senior Notes, due April 2023
Accounting Policies [Line Items]
Fair market value of long-term debt and short-term borrowings				$ 392,100	$ 392,100	$ 403,200
Debt instrument, interest rate		3.625%		3.625%	3.625%	3.625%
Debt instruments maturity date		Apr. 30, 2023			Apr. 30, 2023	Apr. 30, 2023
Net Investment Hedges | 3.625% Senior Notes, due April 2023
Accounting Policies [Line Items]
Derivative notional amount | €		€ 330.0
Foreign Exchange Forward
Accounting Policies [Line Items]
Derivative notional amount				$ 452,000	$ 452,000	$ 406,900
Fair value of foreign currency forwards contracts, liabilities						5,400
Fair value of foreign currency forwards contracts, assets				13,500	13,500
Foreign Exchange Forward | Cash Flow Hedging
Accounting Policies [Line Items]
Derivative notional amount				309,000	309,000	292,100
Foreign Exchange Forward Contracts Related to Net Monetary Assets | Cash Flow Hedging
Accounting Policies [Line Items]
Derivative notional amount				$ 100,000	$ 100,000	$ 100,000
Sales Revenue, Net | Commercial Aerospace Market | Product Concentration Risk
Accounting Policies [Line Items]
Sales revenue percentage					45.00%
U.S. Government | Sales Revenue, Net | Customer Concentration Risk
Accounting Policies [Line Items]
Sales revenue percentage					21.00%	21.00%

[1] 2019