Income Taxes (Tables)

12 Months Ended

Jan. 31, 2016

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,
	2016		2015		2014
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	2.1		(0.3	)	1.5
Tax credit for research activities	(8.8	)	(3.9	)	(1.2	)
Tax benefit on insurance premiums	(3.9	)	(1.0	)	—
Tax benefit on qualified production activities	(3.8	)	(3.6	)	(2.9	)
Other, net	—		0.7		0.2
	20.6	%	26.9	%	32.6	%

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,
	2016			2015			2014
Income taxes:
Currently payable	$	5,242		$	12,663		$	20,098
Deferred (benefit) expense	(3,021		)	(958		)	623
	$	2,221		$	11,705		$	20,721

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,
	2016			2015			2014
Current deferred tax assets:
Accounts receivable	$	355		$	194		$	111
Inventories	602			873			583
Accrued vacation	836			940			1,032
Insurance obligations	350			271			276
Accrued benefit liabilities	99			261			291
Warranty obligations	670			1,225			898
Other accrued liabilities	198			194			181
	3,110			3,958			3,372
Non-current deferred tax assets (liabilities):
Postretirement benefits	2,797			4,243			2,799
Depreciation and amortization	(12,195		)	(16,099		)	(11,522		)
Uncertain tax positions	1,047			1,002			2,219
Share-based compensation	3,593			4,410			3,196
Other	(668		)	(647		)	(218		)
	(5,426		)	(7,091		)	(3,526		)
Net deferred tax (liability)	$	(2,316	)	$	(3,133	)	$	(154	)

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,
	2016			2015			2014
Gross unrecognized tax benefits at beginning of year	$	2,307		$	4,660		$	4,213
Increases in tax positions related to the current year	209			909			795
Decreases as a result of lapses in applicable statutes of limitation	(227		)	(393		)	(348		)
Tax settlement with tax authorities	—			(2,869		)	—
Gross unrecognized tax benefits at end of year	$	2,289		$	2,307		$	4,660