Fair Value Measurements (Tables)

3 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value of Assets Measured on Recurring Basis

The following tables provide information by level for financial assets and liabilities that are measured at fair value on a recurring basis (in thousands):

	Total Fair Value at		Fair Value Measurements Using  Inputs Considered as
	December 31, 2017		Level 1		Level 2		Level 3
Assets:
Money market	$	4,520	$	4,520	$	—	$	—
Corporate bonds	24,191		—		24,191		—
Certificates of deposit	8,260		—		8,260		—
Total assets measured at fair value	$	36,971	$	4,520	$	32,451	$	—
Liabilities:
Contingent consideration on acquired businesses	$	5,981	$	—	$	—	$	5,981
Total liabilities measured at fair value	$	5,981	$	—	$	—	$	5,981

	Total Fair Value at		Fair Value Measurements Using  Inputs Considered as
	September 30, 2017		Level 1		Level 2		Level 3
Assets:
Money market	$	39,524	$	39,524	$	—	$	—
Corporate bonds	28,255		—		28,255		—
Certificates of deposit	8,513		—		8,513		—
Total assets measured at fair value	$	76,292	$	39,524	$	36,768	$	—
Liabilities:
Contingent consideration on acquired businesses	$	6,388	$	—	$	—	$	6,388
Total liabilities measured at fair value	$	6,388	$	—	$	—	$	6,388

Fair Value of Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

The following table presents a reconciliation of the contingent consideration liability measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (in thousands):

	Three months ended December 31,
	2017			2016
Fair value at beginning of period	$	6,388		$	9,960
Purchase price contingent consideration	—			1,300
Contingent consideration payments	—			(518		)
Change in fair value of contingent consideration	(407		)	(82		)
Fair value at end of period	$	5,981		$	10,660