Summary of Restructuring of Operations and Other Items Net (Detail) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Oct. 02, 2011		Sep. 30, 2012		Oct. 02, 2011
Restructuring Expense And Other Items Net [Line Items]
Total restructuring expense	$ 5,655,000		$ 6,812,000		$ 9,929,000		$ 12,297,000
Other items, net	(1,434,000)	[1]	3,972,000	[2]	16,245,000	[3]	(9,611,000)	[4]
Total restructuring of operations and other items, net	4,221,000		10,784,000		26,174,000		2,686,000
Loss on the sale of a property	2,700,000				2,700,000
Asset impairment and exit costs	800,000				800,000
Reversal of sales and use tax liability	1,700,000				1,700,000
Acquisition related costs					8,400,000
Costs of transition service agreements					6,700,000		5,300,000
Sales and use tax liability							14,500,000
Lease Terminations [Member]
Restructuring Expense And Other Items Net [Line Items]
Total restructuring expense	901,000	[5]	311,000	[5]	3,716,000	[5]	3,864,000	[5]
Employee Severance and Benefits [Member]
Restructuring Expense And Other Items Net [Line Items]
Total restructuring expense	1,239,000	[6]	482,000	[6]	2,698,000	[6]	2,414,000	[6]
Asset impairment and other exit charges [Member]
Restructuring Expense And Other Items Net [Line Items]
Total restructuring expense	$ 3,515,000	[7]	$ 6,019,000	[8]	$ 3,515,000	[7]	$ 6,019,000	[8]

[1] Primarily consists of a $1.9 million reversal of a sales and use tax liability as a result of concluding a state tax audit.

[2] Primarily consists of costs related to the transition service agreement associated with the sale of the external storage systems business.

[3] Primarily consists of $8.4 million of SandForce acquisition-related costs and $6.7 million of costs related to the transition service agreement associated with the sale of the external storage systems business, offset in part by a $1.9 million reversal of a sales and use tax liability as a result of concluding a state tax audit.

[4] Primarily consists of the reversal of a $14.5 million sales and use tax related liability as a result of concluding various audits, partially offset by $5.3 million of costs related to the transition service agreement associated with the sale of the external storage systems business.

[5] Includes changes in estimates, changes in time value and on-going expenditures related to previously vacated facilities.

[6] Relates to restructuring actions taken as the Company continued to streamline operations.

[7] Consists of a $2.7 million loss on the sale of a property in the U.S. and $0.8 million of other asset impairment and exit costs.

[8] Primarily relates to write-offs of intellectual property and software which are no longer in use.