Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		6 Months Ended			6 Months Ended		6 Months Ended						1 Months Ended	6 Months Ended		1 Months Ended		1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended		6 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012 Maximum	Mar. 31, 2013 Year One	Mar. 31, 2013 Year One Minimum	Mar. 31, 2013 Year Two	Mar. 31, 2013 Year Two Average	Mar. 31, 2013 There After	Mar. 31, 2013 There After Maximum	Mar. 31, 2013 Base Rate Loans Maximum	Mar. 31, 2013 Base Rate Loans Minimum	Mar. 31, 2013 Eurodollar Loans Maximum	Mar. 31, 2013 Eurodollar Loans Minimum	Oct. 26, 2012 Credit Facility	Mar. 31, 2013 Credit Facility	Mar. 31, 2013 Term Loan	Feb. 28, 2007 Senior Notes	Oct. 26, 2012 Senior Notes Credit Facility	Oct. 26, 2012 Senior Notes Credit Agreement	Mar. 31, 2013 Senior Notes Credit Agreement	Jan. 31, 2011 ABL Credit Facility	Mar. 31, 2013 ABL Credit Facility Credit Facility	Oct. 26, 2012 Revolving Loans Credit Facility	Mar. 31, 2013 Revolving Loans Credit Facility	Mar. 31, 2013 Letter of Credit
Debt Instrument [Line Items]
Aggregate principal amount																	$ 110,000
Annual interest rate	9.00%	9.00%								1.50%	0.75%	2.50%	1.75%				9.00%
Line of credit facility, expiration date																	Feb. 01, 2015				Feb. 01, 2015	Jan. 01, 2014			Apr. 01, 2016
Aggregate principal amount outstanding																			65,000
Redemption price percentage of principal amount																			102.25%
Net loss on debt retirement	(2,835)																			2,835
Call premium amount included in the debt retirement net loss																				1,463
Unamortized debt issuance cost included in the debt retirement net loss																				1,252
Other expenses included in the debt retirement net loss																				120
Drawn amount under the credit facility																		85,000			20,000		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	2,707																							2,707
Letter of credit available																								22,293
Amortization of term loan, 2013																4,500
Amortization of term loan, 2014																6,000
Amortization of term loan, 2015																6,000
Amortization of term loan, 2016																6,000
Amortization of term loan, 2017																7,500
Amortization of term loan, thereafter																30,000
Leverage Ratio	1.33		3.00
Debt Service Coverage Ratio	4.99%				2.00%		2.25%		2.50%
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%