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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income/(loss)	$ (3,555)	$ 36,313	$ 3,962	$ (33,215)
Other comprehensive (loss)/income:
Foreign currency translation adjustment	(409)	5,222	(1,388)	7,592
Unrecognized actuarial gain/(loss) on pension plan, net of tax	18	(37)	22	(25)
Foreign currency translation and pension plan, net of tax	(391)	5,185	(1,366)	7,567
Derivatives designated as hedging instruments:
Unrealized gain on derivative instruments, net of tax	161	540	88	1,029
Reclassification adjustment for loss/(gain) on derivative instruments recognized, net of tax	267	(494)	1,132	(1,540)
Net decrease/(increase) from derivatives designated as hedging instruments, net of tax	428	46	1,220	(511)
Total other comprehensive income/(loss)	37	5,231	(146)	7,056
Comprehensive (loss)/income	$ (3,518)	$ 41,544	$ 3,816	$ (26,159)

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