Goodwill and Intangible Assets - Components of Impaired Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Impairment loss	$ 398	$ 1,960	$ 0
CeligoCell Cytometer product line
Finite-Lived Intangible Assets [Line Items]
Impairment loss	398	1,960
CeligoCell Cytometer product line | Cost of Revenue | Completed technology
Finite-Lived Intangible Assets [Line Items]
Impairment loss	398	1,910
CeligoCell Cytometer product line | Selling, General and Administrative Expenses | Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Impairment loss	$ 0	$ 50