Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended			12 Months Ended
	Sep. 30, 2013 Supplier	Sep. 30, 2012 Supplier	Sep. 30, 2011 Supplier	Dec. 27, 2013 Scenario Forecast	Sep. 30, 2013 Revolving Credit Facility	Sep. 30, 2012 Revolving Credit Facility	Nov. 30, 2012 Revolving Credit Facility	Sep. 30, 2013 Furniture And Equipment Minimum	Sep. 30, 2012 Furniture And Equipment Maximum	Sep. 30, 2011 Building
Summary Of Significant Accounting Policies [Line Items]
Cash overdraft	$ 4,730	$ 3,452
Maturity of cash and cash equivalents	Three months or less
Service lives of assets								5 years	10 years	40 years
Impairment write-downs of property, plant and equipment	754	1,875	759
Legal costs incurred in connection with a lawsuit	1,093
Write-downs of intangible assets	32	1	9
Aggregate amortization expense of intangible assets	149	142	135
Amortization of deferred financing costs	203	105	170
Writeoff of unamortized deferred financing costs	9	22	37
Deferred financing costs	988						988
Payments of Financing Costs	927	61	26		927	61
Options and unvested restricted stock	196,000	321,000	164,000
Company paid cash dividends	9,799	9,325	6,901	2,600
Company paid cash dividends on per share	$ 0.725	$ 0.70	$ 0.525	$ 0.1875
Interest paid, including payments made on interest rate swap agreement	360	1,359	2,266
Income tax paid, net of refunds	16,188	7,432	9,804
No single supplier represented of net purchases	10.00%	10.00%	10.00%
No single provider	0	0	0
Advertising expenses, including Internet advertising expenses	$ 16,984	$ 13,878	$ 11,712