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Investment in JJB Sports (Details) Share data in Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  |
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Apr. 28, 2012 USD ($) | Jul. 28, 2012 USD ($) | Jul. 30, 2011 USD ($) | Jul. 28, 2012 USD ($) | Jul. 30, 2011 USD ($) | Apr. 27, 2012 GBP (£) | Jul. 28, 2012 JJB Sports equity securities USD ($) | Jul. 28, 2012 JJB Sports equity securities USD ($) | Apr. 27, 2012 JJB Sports equity securities GBP (£) | Jul. 28, 2012 JJB Sports convertible notes USD ($) | Jul. 28, 2012 JJB Sports convertible notes USD ($) | Jul. 28, 2012 JJB Sports convertible notes GBP (£) | Apr. 27, 2012 JJB Sports convertible notes GBP (£) | Jul. 28, 2012 JJB Sports convertible notes Conversion Terms at Company Option, after April 27,2013 GBP (£) | Jul. 28, 2012 JJB Sports convertible notes Conversion Terms at JJB Option, after January 26, 2014 GBP (£) | Jul. 28, 2012 JJB Sports convertible notes Conversion Terms, Event of Default GBP (£) | Jul. 28, 2012 Second Convertible Notes Minimum GBP (£) | Jul. 28, 2012 Second Convertible Notes Maximum GBP (£)
Investment in JJB Sports |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate investment amount |  |  |  |  |  | £ 20,000,000 |  |  | £ 1,250,000 |  |  |  | £ 18,750,000 |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  | 12.5 |  |  |  |  |  |  |  |  |
Total cash outlay | 31,986,000 |  |  | 31,986,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, variable rate basis |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |
Interest rate added to base rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Minimum amount of convertible notes and accrued interest for conversion |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 | 5,000,000 |  |
Exceeds earnings before interest, taxes, depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |
Initial conversion price of convertible notes into common stock (in pounds per share) |  |  |  |  |  |  |  |  |  |  |  | £ 0.067 |  |  |  |  |  |
Initial conversion price of accrued interest into common stock (in pounds per share) |  |  |  |  |  |  |  |  |  |  |  | £ 0.10 |  |  |  |  |  |
Subscriptions amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 20,000,000
Other-than-temporary impairment charges on available-for-sale securities |  | $ 32,370,000 | $ 0 | $ 32,370,000 | $ 0 |  | $ 2,023,000 | $ 2,023,000 |  | $ 30,347,000 | $ 30,347,000 |  |  |  |  |  |  |

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