Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	May 31, 2012 Y	May 31, 2011
Warranties
Product warranty period, low end of range (in years)	2
Product warranty period, high end of range (in years)	5
Accrual for warranty returns
Beginning balance	$ 26,665	$ 24,021
Additions to accrual	6,874	7,110
Reductions of the accrual - payments and credits issued	(10,226)	(6,762)
Ending balance	$ 23,313	$ 24,369