Income Taxes (Tables)

12 Months Ended

Sep. 30, 2012

Income Taxes [Abstract]

Components of income before income taxes

	YEAR ENDED SEPTEMBER 30,
	2012		2011		2010
United States	$	50,819	$	43,414	$	21,404
Foreign		1,043		1,205		(502	)
	$	51,862	$	44,619	$	20,902

Computation of provision (benefit) for income taxes

	YEAR ENDED SEPTEMBER 30,
	2012		2011			2010
Current:
Federal	$	15,543	$	15,281		$	8,131
Foreign		24		66			(109	)
State		369		279			214
		15,936		15,626			8,236
Deferred:
Federal		413		(1,228	)		(1,394	)
Foreign		395		510			(22	)
		808		(718	)		(1,416	)
	$	16,744	$	14,908		$	6,820

Reconciliation of actual income tax expenses (benefits)

	YEAR ENDED SEPTEMBER 30,
	2012			2011			2010
Provision for U.S. federal income tax at statutory rate	$	18,153		$	15,617		$	7,313
Effect of foreign income taxes		(140	)		(244	)		(19	)
Manufacturers’/producers’ deduction		(1,868	)		(921	)		(504	)
Research and experimentation tax credits		(99	)		(750	)		(27	)
State income taxes, net of federal income tax benefit		240			181			139
Nondeductible expenses		165			504			197
Resolution of prior years’ tax matters		544			(116	)		(121	)
Contingency for uncertainty in income taxes		(335	)		632			(123	)
Other items		84			5			(35	)
	$	16,744		$	14,908		$	6,820
		32.3	%		33.4	%		32.6	%

Components of net deferred income tax asset

	AS OF SEPTEMBER 30, 2012									AS OF SEPTEMBER 30, 2011
	U. S.			Non U.S.			Total			U. S.			Non U.S.			Total
Deferred income tax assets:
Allowance for doubtful accounts	$	47		$	3		$	50		$	97		$	2		$	99
Inventories		4,472			(28	)		4,444			4,335			—			4,335
Capitalized research and development costs		89			—			89			355			—			355
Property, plant and equipment and other		—			1			1			—			71			71
Net operating loss carryforwards, tax credits and deferrals		—			393			393			—			433			433
Stock-based compensation		347			—			347			333			—			333
Accrued product warranty		787			12			799			723			11			734
Accrued compensated absences		443			—			443			408			—			408
Insurance and other reserves		938			27			965			788			31			819
		7,123			408			7,531			7,039			548			7,587
Deferred income tax liabilities:
Allowance for doubtful accounts		—			(122	)		(122	)		—			(120	)		(120	)
Intangible assets		(144	)		—			(144	)		(58	)		—			(58	)
Comprehensive income		121			—			121			(92	)		—			(92	)
Property, plant and equipment and other		(3,056	)		(201	)		(3,257	)		(2,645	)		—			(2,645	)
Subtotal deferred income tax asset		4,044			85			4,129			4,244			428			4,672
Valuation allowance		—			(87	)		(87	)		—			—			—
Net deferred income tax asset	$	4,044		$	(2	)	$	4,042		$	4,244		$	428		$	4,672

Net Classification of deferred income taxes in balance sheet

	AS OF SEPTEMBER 30,
	2012			2011
Current deferred income tax asset	$	6,689		$	6,356
Noncurrent deferred income tax asset		307			505
Current deferred income tax liability		(111	)		(82	)
Noncurrent deferred income tax liability		(2,843	)		(2,107	)
	$	4,042		$	4,672

Reconciliation of the total amounts of unrecognized tax benefits

Balance at October 1, 2009	$	241
Change in prior year tax positions		(73	)
Current tax positions		77
Lapse of statute of limitations		(25	)
Balance at September 30, 2010		220
Change in prior year tax positions		581
Current tax positions		61
Lapse of statute of limitations		(10	)
Balance at September 30, 2011		852
Change in prior year tax positions		(420	)
Current tax positions		63
Settlements with taxing authorities		(145	)
Lapse of statute of limitations		5
Balance at September 30, 2012	$	355