Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended						12 Months Ended							1 Months Ended	12 Months Ended		1 Months Ended				1 Months Ended	12 Months Ended		1 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Year One	Sep. 30, 2013 Year Two	Sep. 30, 2013 There After	Sep. 30, 2013 Minimum Year One	Sep. 30, 2013 Maximum	Sep. 30, 2013 Maximum There After	Sep. 30, 2013 Average Year Two	Sep. 30, 2013 Base Rate Loans Minimum	Sep. 30, 2013 Base Rate Loans Maximum	Sep. 30, 2013 Eurodollar Loans Minimum	Sep. 30, 2013 Eurodollar Loans Maximum	Oct. 26, 2012 Credit Facility	Sep. 30, 2013 Credit Facility	Sep. 30, 2013 Term Loan	Jan. 31, 2011 ABL Credit Facility	Sep. 10, 2012 Senior Notes	Feb. 28, 2007 Senior Notes	Aug. 31, 2012 Senior Notes	Oct. 26, 2012 Senior Notes Credit Agreement	Sep. 30, 2013 Senior Notes Credit Agreement	Oct. 26, 2012 Senior Notes Credit Facility	Oct. 26, 2012 Revolving Loans Credit Facility	Sep. 30, 2013 Revolving Loans Credit Facility	Sep. 30, 2013 Standby Letters of Credit	Sep. 30, 2013 Letter of Credit
Debt Instrument [Line Items]
Aggregate principal amount																			$ 110,000
Annual interest rate	9.00%	9.00%								0.75%	1.50%	1.75%	2.50%						9.00%
Line of credit facility, expiration date																	Feb. 01, 2015		Feb. 01, 2015							Apr. 01, 2016	Apr. 01, 2017
Redeemed amount of the outstanding principle amount																				40,000
Redemption price percentage of principal amount																		102.25%			102.25%
Loss result from repurchase of senior note																		1,397
Call premium amount included in the debt retirement net loss																		900				1,463
Unamortized debt issuance cost included in the debt retirement net loss																		482				1,252
Other expenses included in the debt retirement net loss																		15				120
Aggregate principal amount outstanding																					65,000
Net loss on debt retirement	(2,835)	(1,397)																				2,835
Drawn amount under the credit facility																	20,000						85,000	25,000
Maturity period for the credit facility														5 years			90 days
Principal amount under the credit facility														60,000
Outstanding amount in connection with the issuance of letter of credit																								5,000
Letter of credit outstanding	4,466																								4,466	315
Letter of credit available																									20,534
Amortization of term loan, 2013	6,002															4,500
Amortization of term loan, 2014	6,000															6,000
Amortization of term loan, 2015	6,000															6,000
Amortization of term loan, 2016	7,500															6,000
Amortization of term loan, 2017	30,000															7,500
Amortization of term loan, thereafter																30,000
Leverage Ratio	1.04						3.00
Debt Service Coverage Ratio	6.21%					2.00%		2.50%	2.25%
Debt Service Coverage Ratio Commencing Date			Sep. 30, 2014	Sep. 29, 2015	Sep. 30, 2015
Debt issuance cost															$ 1,386
Percentage of Letter of credit outstanding																											105.00%