Other Comprehensive Income (Loss) (Schedule of Amounts Reclassified out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 233,046	$ 191,323	$ 436,227	$ 385,485
Interest expense, net	(7,368)	(6,708)	(14,186)	(13,512)
Provision for income taxes	(2,916)	(1,738)	(3,612)	21,943
Cost of sales	(145,696)	(116,498)	(270,572)	(232,732)
Selling and marketing	(33,395)	(30,597)	(65,484)	(62,625)
General and administrative	(22,105)	(18,992)	(43,183)	(39,554)
Other income (expense), net	270	274	319	51
Income before income taxes	17,076	10,176	28,273	19,646
Net income	14,160	8,438	24,661	41,589
Reclassification Out Of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	472	(782)	1,290	(976)
Reclassification Out Of Accumulated Other Comprehensive Income \| Unrealized Derivative Instrument
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	(158)	239	(413)	275
Net income	567	(687)	1,481	(790)
Reclassification Out Of Accumulated Other Comprehensive Income \| Defined Benefit Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	42	42	83	81
Cost of sales	0	(75)	0	(146)
Selling and marketing	0	(38)	0	(75)
General and administrative	0	(24)	0	(46)
Other income (expense), net	(137)	0	(274)	0
Income before income taxes	(137)	(137)	(274)	(267)
Net income	(95)	(95)	(191)	(186)
Reclassification Out Of Accumulated Other Comprehensive Income \| Currency exchange contracts gain (loss) \| Unrealized Derivative Instrument
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	16	(1,146)	601	(1,304)
Reclassification Out Of Accumulated Other Comprehensive Income \| Interest rate swaps \| Unrealized Derivative Instrument
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	$ 709	$ 220	$ 1,293	$ 239

The aggregate cost of goods produced and sold and services rendered during the reporting period.

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