Retirement and Postretirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 28, 2010
Pension Plans [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	$ 170,160	$ 162,845
Service cost	1,106	957	730
Interest cost	8,353	8,757	9,279
Participant contributions	29	28
Plan amendments	924	198
Actuarial loss (gain)	15,310	5,825
Benefit payments	(11,036)	(10,567)
Settlements		52
Currency exchange rate changes	(502)	2,065
Benefit obligation at end of year	184,344	170,160	162,845
Change in plan assets:
Fair value of plan assets at beginning of year	107,881	102,092
Actual return on plan assets	7,172	11,311
Employer contributions	2,736	3,187
Participant contributions	29	28
Benefit payments	(11,036)	(10,567)
Settlements		52
Currency exchange rate changes	(441)	1,778
Fair value of plan assets at end of year	106,341	107,881	102,092
Funded status at end of year	(78,003)	(62,279)
Postretirement benefit plan [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	91,035	110,921
Service cost	726	2,290	2,365
Interest cost	3,929	6,014	7,359
Participant contributions	4,585	4,165
Retiree drug subsidy payments	1,072	1,670
Plan amendments		(7,263)
Actuarial loss (gain)	(10,726)	(18,639)
Benefit payments	(8,277)	(8,123)
Benefit obligation at end of year	82,344	91,035	110,921
Change in plan assets:
Fair value of plan assets at beginning of year	66,935	66,928
Actual return on plan assets	(1,301)	7,130
Employer contributions	(4,379)	(3,165)
Participant contributions	4,585	4,165
Benefit payments	(8,277)	(8,123)
Fair value of plan assets at end of year	57,563	66,935	66,928
Funded status at end of year	$ (24,781)	$ (24,100)