Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended				1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended
	Feb. 24, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2012 Mexico	Jun. 16, 2011 Securities Litigation	Mar. 31, 2012 Securities Litigation	Sep. 30, 2012 Securities Litigation	Jun. 16, 2011 Securities Litigation Insurance Company	Jun. 16, 2011 Securities Litigation Income	Feb. 24, 2011 Securities Litigation Mr. Therrien
Commitments and Contingencies Disclosure [Line Items]
Rental expense under operating leases		$ 4,800,000	$ 4,900,000	$ 4,700,000
Description of leasing arrangements		The Company leases manufacturing and office facilities and certain equipment under operating leases that expire through 2022.
Operating lease arrangements, year of expiration		2022
Lease guaranteed by company, expiration date					2015-01
Remaining payments under lease guarantee					900,000
Outstanding letters of credit		3,300,000
Non-cancelable contracts and purchase orders for inventory		64,300,000
Proceeds from sale of shares											1,900,000
Number of shares sold											150,000
Reimbursement to Mr. Therrien towards his disgorgement payment	500,000
Net amount to be recovered from insurance company	3,500,000
Litigation settlement, disgorgement payment											728,000
Litigation settlement, fines											100,000
Proceeds from litigation settlement						1,300,000
Percent of litigation settlement									50.00%	50.00%
Net insurance proceeds							$ 3,300,000	$ 3,300,000