Warranties (Tables)

3 Months Ended

Apr. 30, 2012

Product Warranty Costs [Abstract]

Warranties

Changes in the warranty accrual were as follows:

	Three Months Ended
	April 30, 2012			April 30, 2011
Beginning balance	$	1,699		$	1,437
Accrual for warranties	820			807
Settlements made (in cash or in kind)	(727		)	(613		)
Ending balance	$	1,792		$	1,631