Related Party Transactions (Details) $ / shares in Units, $ in Thousands				3 Months Ended		6 Months Ended
	Mar. 24, 2017 board_members	Jan. 31, 2017 USD ($) board_members $ / shares shares	Feb. 25, 2009 board_members demand_registration shares	Jul. 29, 2017 USD ($) shares	Jul. 30, 2016 USD ($)	Jul. 29, 2017 USD ($) board_members shares	Jul. 30, 2016 USD ($)	Jan. 28, 2017 shares	Apr. 29, 2016 $ / shares shares	Jul. 10, 2015
Related Party Transaction [Line Items]
Common stock, shares owned by related party				65,220,233		65,220,233		65,192,314
Related party, ownership interest in Company, percentage										4.99%
Common stock repurchased from NBCU, Value | $						$ 5,055
Number of board members appointed by affiliates who hold beneficial ownership, Upper limit | board_members			3
Minimum beneficial ownership percentage of partners, Upper limit			50.00%
Beneficial ownership to equal at least 50% as of February 25, 2009, Shares			8,700,000
Number of board members appointed by affiliates who hold beneficial ownership, Lower limit | board_members			2
Minimum beneficial ownership percentage of partners, Lower limit			10.00%
Number of board of directors designated by GE Equity or NBCU serving on board | board_members	1					0
Registration Rights Agreement, number of aggregate demand registrations | demand_registration			5
GE [Member]
Related Party Transaction [Line Items]
Common stock, shares owned by related party									3,545,049
Sale of stock, price per share | $ / shares									$ 2.15
NBCU [Member]
Related Party Transaction [Line Items]
Common stock repurchased from NBCU, Shares		4,400,000
Common stock, shares owned by related party		2,741,849		2,741,849		2,741,849
Percentage of ownership in Company after transaction		4.50%
Related party, ownership interest in Company, percentage		6.70%		4.20%		4.20%
Common stock repurchased from NBCU, Value | $		$ 5,000
Sale of stock, price per share | $ / shares		$ 1.12
Number of board members appointed by affiliates who hold beneficial ownership, Upper limit | board_members		1
Minimum beneficial ownership to retain board seat, percentage		5.00%
Affiliate ownership percentage threshold to sell outstanding shares, Lower threshold		5.00%
Affiliate ownership percentage threshold to sell outstanding shares, Upper threshold		90.00%
Maximum aggregate transfer of beneficial ownership to individual, percentage		20.00%
Newgistics, Inc. [Member]
Related Party Transaction [Line Items]
Purchases from related party | $				$ 1,141	$ 1,069	$ 2,286	$ 2,534
On Air Food Supplier [Member]
Related Party Transaction [Line Items]
Purchases from related party | $				$ 480	$ 354	$ 826	$ 1,223