CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 11,653	$ 56,676	$ 126,099
Other comprehensive income:
Foreign currency translation adjustment	(6,534)	(3,633)	1,960
Unrecognized actuarial gain on pension plan, net of tax	22	116	990
Other Comprehensive Income (Loss), Foreign Currency Transaction, Translation Adjustment and unrecognized actuarial (loss), Net of Tax, Portion Attributable to Parent	(6,512)	(3,517)	2,950
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(741)	(669)	669
Other Comprehensive Loss, Reclassification Adjustment from AOCI on Derivatives, Net of Tax	1,215	(1,755)	1,146
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	474	(2,424)	1,815
Total other comprehensive (loss) / income	(6,038)	(5,941)	4,765
Comprehensive income	$ 5,615	$ 50,735	$ 130,864