Income Taxes (Tables)

12 Months Ended

Jan. 31, 2017

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,
	2017		2016		2015
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	0.7		(2.8	)	(0.3	)
Tax credit for research activities	(3.7	)	(24.2	)	(3.9	)
Tax benefit on qualified production activities	(2.8	)	(13.7	)	(3.6	)
Tax benefit on insurance premiums	(1.5	)	(10.3	)	(1.0	)
Change in uncertain tax positions	(0.3	)	1.8		—
Foreign tax rate difference	(0.3	)	(2.9	)	0.4
Other, net	0.4		(1.7	)	0.3
	27.5	%	(18.8	)%	26.9	%

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,
	2017		2016			2015
Income taxes:
Currently payable	$	7,354	$	5,272		$	12,663
Deferred expense (benefit)	307		(6,039		)	(958		)
	$	7,661	$	(767	)	$	11,705

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,
	2017			2016			2015
Deferred tax assets:
Accounts receivable(a)	$	212		$	355		$	194
Inventories(a)	978			602			873
Accrued vacation(a)	887			836			940
Insurance obligations(a)	383			350			271
Accrued benefit liabilities(a)	41			99			261
Warranty obligations(a)	565			670			1,225
Postretirement benefits	3,072			2,797			4,243
Uncertain tax positions	803			896			1,002
Share-based compensation	3,201			3,613			4,410
Other accrued liabilities(a)	68			198			194
	10,210			10,416			13,613
Deferred tax (liabilities):
Depreciation and amortization	(10,565		)	(9,886		)	(16,099		)
Other	(1,048		)	(667		)	(647		)
	(11,613		)	(10,553		)	(16,746		)
Net deferred tax (liability)	$	(1,403	)	$	(137	)	$	(3,133	)

^(a) As discussed below, under the prior accounting guidance these deferred tax assets were classified as current deferred tax assets. All other deferred tax assets and liabilities were classified as non-current.

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,
	2017			2016			2015
Gross unrecognized tax benefits at beginning of year	$	2,327		$	2,307		$	4,660
Increases in tax positions related to the current year	279			395			909
Decreases in tax positions related to prior years	(193		)	—			—
Decreases as a result of lapses in applicable statutes of limitation	(303		)	(375		)	(393		)
Tax settlement with tax authorities	—			—			(2,869		)
Gross unrecognized tax benefits at end of year	$	2,110		$	2,327		$	2,307