Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 24, 2012	Jun. 26, 2011	Jun. 24, 2012	Jun. 26, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' equity at beginning of period			$ 312.6	$ 169.9
Net loss	(17.2)	(5.2)	(20.2)	(8.7)
Foreign currency translation	(0.2)	0	(0.2)	0
Total comprehensive loss	(17.4)	(5.2)	(20.4)	(8.7)
Additional paid-in capital from the issuance of common stock for cash			97.0	61.1
Stock-based compensation			2.3	1.4
Employee stock purchase plan and restricted stock units settled in cash			0	0.3
Exercise of stock options and warrants			0	1.1
Fair value of stock options assumed in acquisition			0	1.9
Stockholders' equity at end of period	$ 391.5	$ 227.0	$ 391.5	$ 227.0

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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Items including common stock value, paid in capital, retained earnings, common stock purchased for the treasury and excluding noncontrolling interests (minority interests) and preferred stockholder interests.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency, which is attributable to the parent entity.

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Value of stock issued pursuant to acquisitions during the period.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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