Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Dec. 30, 2018	Sep. 29, 2019	Sep. 30, 2018	Oct. 01, 2017	Oct. 02, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective tax rate (as a percent)			9.30%	21.50%	31.30%
Tax Cuts and Jobs Act, transition tax			$ 2,400
Tax at federal statutory rate			21.00%	24.50%	35.00%
Deferred tax benefit from tax reform remeasurement		$ 2,600		$ 10,100
Decrease in deferred tax valuation allowance	$ 23,400
Effective income tax rate excluding excess tax benefit and TCJA impact			21.90%	25.10%
Tax Cuts And Jobs Act, GILTI Provision			$ 400
Undistributed earnings of foreign subsidiaries			44,000
Incremental federal tax due to repatriation of foreign earnings			1,100
Valuation allowance			20,543	$ 21,479
Unrecognized tax benefits			9,169	8,328	$ 9,337	$ 22,786
Accrued additional interest expense			500	600	400
Reduction in accrued interest			200	300	900
Amount of interest and penalties accrued			2,400	$ 1,200	$ 1,100
State
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net operating loss carry forwards which expire at various dates			43,700
Foreign
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in deferred tax valuation allowance			23,400
Net operating loss carry forwards which expire at various dates			29,700
Net operating loss carryforwards			134,700
Net operating loss carry forwards which have no expiration date			$ 105,000