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Summary of Activity in Accounts Receivable Reserves for Doubtful Accounts and Sales Returns (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 38,315	$ 53,076	$ 53,076	$ 48,306	$ 36,521
Provision for doubtful accounts and sales returns	16,442	22,455	31,673	33,077	34,904
Write-offs, net of recoveries	(23,666)	(24,288)	(46,434)	(28,307)	(23,119)
Balance, end of period	$ 31,091	$ 51,243	$ 38,315	$ 53,076	$ 48,306

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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