Summary of Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012 customer	Dec. 31, 2011 customer	Jan. 01, 2011
Summary of Significant Accounting Policies (Textual) [Abstract]
Revenue from two International Distributors of home robots products	15.10%	36.10%	38.40%
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Cash equivalents comprised of money market and savings account funds	$ 88.1	$ 117.2
Number of customers with accounts receivable balance greater than 10% of total receivables	3	4
Percentage of receivables held by three customers	55.00%
Percentage of receivables held by four customers		63.00%
Minimum percentage help by each customer with an accounts receivable balance greater than 10% of the total accounts receivable balance	10.00%	10.00%
Number of customers with accounts receivable balance greater than 10% of total receivables secured by guaranteed letters of credit	2	2
Percentage of receivables secured by guaranteed letter of credit for customers with accounts receivable balance greater than 10% of the total accounts receivable balance	36.00%	29.00%
Advertising cost	34.9	20.4	13.8
Potentially diluted shares of common stock	0.8	0.4	1.0
Valuation allowance related to acquired entity	2.7
Deferred tax assets before valuation allowance	30.6
Valuation allowance	$ 2.7
International distributors of home robots products [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Revenue from two International Distributors of home robots products	30.60%	23.60%