Accrued and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Accrued Liabilities [Line Items]
Accrued employee related costs	$ 6,051	$ 5,843
Accrued employee stock purchase plan contributions	2,459
Accrued inventory purchases	2,182	846
Accrued payroll and other taxes	2,080	4,662
Accrued professional services	1,097	1,280
Customer deposits	557
Gigamon LLC members’ distribution payable	500	4,821
Accrued warranty, current	323	195
Sales return reserve	222	240
Other accruals	2,274	823
Total accrued and other current liabilities	$ 17,745	$ 18,710