Income Taxes (Tables)

12 Months Ended

Jan. 31, 2015

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,
	2015		2014		2013
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	(0.3	)	1.5		1.6
Tax credit for research activities	(3.9	)	(1.2	)	(0.9	)
Tax benefit on qualified production activities	(3.6	)	(2.9	)	(3.2	)
Other, net	(0.3	)	0.2		(0.2	)
	26.9	%	32.6	%	32.3	%

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,
	2015			2014		2013
Income taxes:
Currently payable	$	12,663		$	20,098	$	26,894
Deferred (benefit) expense	(958		)	623		(1,803		)
	$	11,705		$	20,721	$	25,091

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,
	2015			2014			2013
Current deferred tax assets:
Accounts receivable	$	194		$	111		$	70
Inventories	873			583			507
Accrued vacation	940			1,032			1,118
Insurance obligations	271			276			302
Accrued benefit liabilities	261			291			274
Warranty obligations	1,225			898			661
Other accrued liabilities	194			181			175
	3,958			3,372			3,107
Non-current deferred tax assets (liabilities):
Postretirement benefits	4,243			2,799			2,826
Depreciation and amortization	(16,099		)	(11,522		)	(9,114		)
Uncertain tax positions	1,002			2,219			1,969
Share-based compensation	2,897			2,309			1,613
Other	866			669			253
	(7,091		)	(3,526		)	(2,453		)
Net deferred tax (liability) asset	$	(3,133	)	$	(154	)	$	654

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,
	2015			2014			2013
Gross unrecognized tax benefits at beginning of year	$	4,660		$	4,213		$	3,567
Increases in tax positions related to the current year	909			795			993
Decreases as a result of lapses in applicable statutes of limitation	(393		)	(348		)	(347		)
Tax settlement with tax authorities	(2,869		)	—			—
Gross unrecognized tax benefits at end of year	$	2,307		$	4,660		$	4,213