Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014
Income Tax Disclosure [Line Items]
Income tax provisions associated with income from continuing operations	$ 1,929,000		$ 1,729,000	$ 4,879,000	$ 4,407,000
Effective tax rates	32.90%		32.00%	31.50%	31.10%
U.S. federal statutory tax rate	35.00%		35.00%	35.00%	35.00%
Discrete tax benefit				$ 200,000
Gain on sale of investment		$ 500,000
Gain on contingent consideration payment			$ 28,000		$ 709,000
Gain on debt securities available for sale securities portfolio					$ 100,000
Effective income tax rate associated with discontinued operations			34.80%		34.80%
Unrecognized tax benefits including interest and penalties	$ 1,000,000			1,000,000		$ 900,000
Intersect ENT [Member]
Income Tax Disclosure [Line Items]
Gain on sale of investment				500,000
Maximum [Member]
Income Tax Disclosure [Line Items]
Discrete tax benefit	100,000		$ 100,000	300,000	$ 300,000
Income tax benefit from discontinued operations	$ 0		$ 100,000	$ 0	$ 100,000