Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (7,758)	$ 3,886
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	1,964	878
Stock-based compensation expense	25,357	2,329
Deferred income taxes	(23,982)
(Recovery) write-down of Inventories	(382)	1,587
Loss on disposal of fixed assets	14	51
Changes in operating assets and liabilities:
Accounts receivable	(6,358)	5,078
Inventories	4,207	1,976
Prepaid expenses and other assets	(2,269)	1,382
Accounts payable	(1,643)	(1,118)
Accrued and other liabilities	1,770	4,943
Deferred revenue	10,125	4,893
Net cash provided by operating activities	1,045	25,885
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of short-term investments	(40,342)
Purchases of property and equipment	(2,826)	(1,505)
Net cash used in investing activities	(43,168)	(1,505)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from (costs for) initial public offering	95,391	(572)
Distribution of income to Gigamon LLC members	(6,997)	(13,200)
Proceeds from exercise of stock options	111
Net cash provided by (used in) financing activities	88,505	(13,772)
NET INCREASE IN CASH AND CASH EQUIVALENTS	46,382	10,608
CASH AND CASH EQUIVALENTS — Beginning of period	18,675	13,102
CASH AND CASH EQUIVALENTS — End of period	65,057	23,710
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Income taxes paid during the period	65	65
NONCASH INVESTING AND FINANCING ACTIVITIES:
Conversion of preferred stock into common stock	29,432
Accretion of preferred stock to redemption value and issuance costs discount	1,088	1,661
Unpaid deferred offering costs for follow-on public offering	144
IPO
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from (costs for) initial public offering	93,400
NONCASH INVESTING AND FINANCING ACTIVITIES:
Unpaid deferred offering costs for follow-on public offering	$ 112	$ 1,887