Income Taxes (Tables)

12 Months Ended

Jan. 31, 2013

Income Tax Disclosure [Abstract]

Reconciliation of income tax computed at the federal statutory rate to the company's effective income tax rate

The reconciliation of income tax computed at the federal statutory rate to the Company's effective income tax rate was as follows:

	For the years ended January 31,
	2013		2012		2011
Tax at U.S. federal statutory rate	35.0	%	35.0	%	35.0	%
State and local income taxes, net of U.S. federal tax benefit	1.6		1.0		1.3
Tax benefit on qualified production activities	(3.2	)	(2.4	)	(3.0	)
Tax credit for research activities	(0.9	)	(0.7	)	(0.7	)
Other, net	(0.2	)	0.2		0.2
	32.3	%	33.1	%	32.8	%

Significant components of the company's income tax provision

Significant components of the Company's income tax provision were as follows:

	For the years ended January 31,
	2013			2012		2011
Income taxes:
Currently payable	$	26,894		$	19,705	$	19,322
Deferred (benefit) expense	(1,803		)	5,358		423
	$	25,091		$	25,063	$	19,745

Significant components of the company's deferred tax assets and liabilities

Significant components of the Company's deferred tax assets and liabilities were as follows:

	As of January 31,
	2013			2012			2011
Current deferred tax assets:
Accounts receivable	$	70		$	58		$	103
Inventories	507			452			463
Accrued vacation	1,118			1,248			1,008
Insurance obligations	576			559			485
Warranty obligations	661			595			503
Other accrued liabilities	175			387			171
	3,107			3,299			2,733
Non-current deferred tax assets (liabilities):
Postretirement benefits	2,826			2,571			2,014
Depreciation and amortization	(9,114		)	(9,673		)	(3,050		)
Uncertain tax positions	1,969			1,673			1,426
Share-based compensation	1,613			981			601
Other	253			(70		)	(67		)
	(2,453		)	(4,518		)	924
Net deferred tax asset (liability)	$	654		$	(1,219	)	$	3,657

Summary of the activity related to the gross unrecognized tax benefits (excluding interest and penalties)

A summary of the activity related to the gross unrecognized tax benefits (excluding interest and penalties) is as follows:

	For the years ended January 31,
	2013			2012			2011
Gross unrecognized tax benefits at beginning of year	$	3,567		$	3,112		$	2,656
Increases in tax positions related to the current year	993			699			601
Decreases as a result of lapses in applicable statutes of limitation	(347		)	(244		)	(145		)
Gross unrecognized tax benefits at end of year	$	4,213		$	3,567		$	3,112