Employee Retirement Benefits Employee Retirement Benefits (Tables)

12 Months Ended

Jan. 31, 2012

Employee Retirement Benefits [Abstract]

The accumulated benefit obligation

The accumulated benefit obligation for these benefits is shown below:

	For the years ended January 31
	2012			2011			2010
Benefit obligation at beginning of year	$	5,969		$	5,512		$	4,840
Service cost	121			62			55
Interest cost	334			324			332
Actuarial (gain) loss and assumption changes	1,363			237			476
Total recognized in net and other comprehensive income	1,818			623			863
Retiree benefits paid	(227		)	(166		)	(191		)
Benefit obligation at end of year	$	7,560		$	5,969		$	5,512

The liability and expense reflected in the balance sheet and income statement

The liability and expense reflected in the balance sheet and income statement were as follows:

	For the years ended January 31
	2012			2011			2010
Beginning liability balance	$	5,969		$	5,512		$	4,840
Employer expense	582			552			515
Other comprehensive (income) loss	1,236			71			348
Total recognized in net and other comprehensive income	1,818			623			863
Retiree benefits paid	(227		)	(166		)	(191		)
Ending liability balance	$	7,560		$	5,969		$	5,512
Current portion in accrued liabilities	$	212		$	212		$	229
Long-term portion in other liabilities	$	7,348		$	5,757		$	5,283
Assumptions used:
Discount rate	4.50		%	5.75		%	6.00		%
Wage inflation rate	4.00		%	4.00		%	3.00		%