Income Taxes - Tax Effect of Temporary Differences and Carryforwards which Give Rise to Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012
Current:
Allowance for doubtful accounts, Deferred Tax Assets	$ 7,758	$ 6,741
Inventory write-downs, Deferred Tax Assets	14,983	10,411
Prepaid expenses, Deferred Tax Assets	620	112
Nondeductible reserves, Deferred Tax Assets	2,782	997
State taxes, Deferred Tax Assets	0	0
Employee benefits, Deferred Tax Assets	6,062	5,885
Other, Deferred Tax Assets	3,012	3,509
Total, Current Deferred Tax Assets	35,218	27,655
Noncurrent:
Depreciation and amortization, Deferred Tax Assets	0	0
Equity income, Deferred Tax Assets	0	0
State net operating loss carryforward, Deferred Tax Assets	4,816	4,160
Stock based compensation, Deferred Tax Assets	6,061	5,225
State credits, Deferred Tax Assets	2,421	2,241
Other, Deferred Tax Assets	5,349	2,866
Valuation allowance, Deferred Tax Assets	(6,968)	(7,282)
Total, Noncurrent Deferred Tax Assets	11,679	7,210
Total, Deferred Tax Assets	46,897	34,865
Allowance for doubtful accounts, Deferred Tax Liabilities	0	0
Inventory write-downs, Deferred Tax Liabilities	0	0
Prepaid expenses, Deferred Tax Liabilities	0	0
Nondeductible reserves, Deferred Tax Liabilities	0	0
State taxes, Deferred Tax Liabilities	188	245
Employee benefits, Deferred Tax Liabilities	0	0
Other, Deferred Tax Liabilities	0	0
Total, Current Deferred Tax Liabilities	188	245
Depreciation and amortization, Deferred Tax Liabilities	39,100	30,358
Equity income, Deferred Tax Liabilities	393	280
State net operating loss carryforward, Deferred Tax Liabilities	0	0
Stock based compensation, Deferred Tax Liabilities	0	0
State credits, Deferred Tax Liabilities	0	0
Other, Deferred Tax Liabilities	0	0
Valuation allowance, Deferred Tax Liabilities	0	0
Total, Noncurrent Deferred Tax Liabilities	39,493	30,638
Total, Deferred Tax Liabilities	$ 39,681	$ 30,883