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Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	Jun. 29, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017
Financial assets:
Cash equivalents	$ 106,155	$ 93,058
Marketable securities	54,626	55,951
Forward contracts	4,202	2,889
Financial assets, fair value	164,983	151,898
Financial liabilities:
Contingent consideration related to acquisitions		1,575
Forward contracts	5,397	3,419
Financial liabilities, fair value	5,397	4,994
Level 1
Financial assets:
Cash equivalents	106,155	93,058
Financial assets, fair value	156,306	147,795
Level 2
Financial assets:
Forward contracts	4,202	2,889
Financial assets, fair value	8,677	4,103
Financial liabilities:
Forward contracts	5,397	3,419
Financial liabilities, fair value	5,397	3,419
Level 3
Financial liabilities:
Contingent consideration related to acquisitions		1,575	$ 2,100	$ 8,400
Financial liabilities, fair value		1,575
Certificates of deposit
Financial assets:
Marketable securities		219
Certificates of deposit | Level 2
Financial assets:
Marketable securities		219
Commercial paper
Financial assets:
Marketable securities	4,475
Commercial paper | Level 2
Financial assets:
Marketable securities	4,475
Corporate notes/bonds
Financial assets:
Marketable securities	50,151	54,737
Corporate notes/bonds | Level 1
Financial assets:
Marketable securities	$ 50,151	54,737
U.S. government agency securities
Financial assets:
Marketable securities		995
U.S. government agency securities | Level 2
Financial assets:
Marketable securities		$ 995

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