Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration related to acquisitions			$ 1,575
Payment of contingent consideration	$ 1,600	$ 8,400
Business Combination, Consideration Transferred, Liabilities Incurred	1,600	7,800
Cost Method Investments	$ 9,400		1,700
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration related to acquisitions		2,100	$ 1,575	$ 8,400
Payment of contingent consideration		8,400
Kepware | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration related to acquisitions		0		$ 8,400
Payment of contingent consideration		$ 8,400