Warranty (Detail)	3 Months Ended
	Dec. 31, 2012
Standard Product Warranty Description	A limited warranty is provided on our products for periods ranging from 3 to 12 months, and allowances for estimated warranty costs are recorded during the period of sale. The determination of such allowances requires management to make estimates of product return rates and expected costs to repair or replace products under warranty. If actual return rates or repair and replacement costs, or both, differ significantly from management estimates, adjustments to the expense will be required.