Changes in Fair Value of Company Level 3 Financial Instruments (Details) - Nonrecurring - Significant Unobservable (Level 3) $ in Thousands	12 Months Ended
	Sep. 30, 2019 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance	$ 7,713
Contingent consideration pursuant to acquisitions	4,342
Fair value adjustments	(2,115)
Balance	$ 9,940