Warranties (Tables)

6 Months Ended

Jul. 31, 2012

Product Warranty Costs [Abstract]

Warranties

Changes in the warranty accrual were as follows:

	Three Months Ended						Six Months Ended
	July 31, 2012			July 31, 2011			July 31, 2012			July 31, 2011
Beginning balance	$	1,792		$	1,631		$	1,699		$	1,437
Accrual for warranties	778			781			1,598			1,588
Settlements made (in cash or in kind)	(621		)	(770		)	(1,348		)	(1,383		)
Ending balance	$	1,949		$	1,642		$	1,949		$	1,642