Income Taxes (Tables)

12 Months Ended

Sep. 30, 2012

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

		2012		2011		2010
Income before taxes
	United States	$	81,482	$	65,271	$	52,110
	Foreign		4,458		3,429		2,216
Total income before taxes		$	85,940	$	68,700	$	54,326

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

			2012		2011		2010
United States
	Current payable
		Federal	$	25,535	$	20,741	$	17,060
		State		4,494		3,696		2,751
	Deferred
		Federal		1,308		628		538
		State		220		120		95
Total U.S. tax expense				31,557		25,185		20,444
International
	Current payable			1,252		1,109		826
	Deferred			(346)		(174)		(384)
Total international tax expense				906		935		442
Total income tax expense			$	32,463	$	26,120	$	20,886

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		2012		2011
Deferred tax assets:
	Allowance for doubtful accounts	$	958	$	1,005
	Inventories		521		363
	Lease expense		394		282
	Employee benefits		439		740
	Other		368		325
Total deferred tax assets			2,680		2,715
Deferred tax liabilities:
	Property and equipment		(7,684)		(6,534)
	Prepaid expenses		(395)		(316)
	Other		(201)		(182)
Total deferred tax liabilities			(8,280)		(7,032)
Net deferred liabilities		$	(5,600)	$	(4,317)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2012		2011		2010
Taxes computed at statutory rate		35.0%		35.0%		35.0%
State income taxes (net of federal income tax benefit)		3.6		3.7		3.5
Foreign		(1.1)		(0.9)		(1.1)
Other		0.3		0.2		1.0
		37.8%		38.0%		38.4%

Summary of Income Tax Contingencies [Table Text Block]

	2012		2011		2010
Unrecognized tax benefits – Beginning of year	$	23	$	198	$	223
Gross decreases related to prior period tax positions		(8)		(175)		-
Gross increases related to current period tax positions		-		-		175
Settlements		(15)		-		(200)
Unrecognized tax benefits – End of year	$	0	$	23	$	198