Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Accrued distributor price adjustments	$ 4,017	$ 3,877
Expected instrument utilization period	3 years
Period of review of accounts individually	90 days
Tax benefits recognized from uncertain tax positions measurement	Greater than 50% likely of being ultimately realized upon settlement
Likelihood percentage of tax benefit being realized upon settlement	50.00%