Business Combination Details (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 28, 2013
BusinessCombinationsAbstract
BusinessAcquisitionNameOfAcquiredEntity	Spirit-Progresstech
Reason for business combination	Based on the evaluation of our Spirit-Progresstech joint venture in the first quarter, the Company has made the determination that the Company has the power to direct the activities of Spirit-Progresstech. This determination was made based on the amount of revenue Spirit-Progresstech derives from Spirit in relation to the entire revenue generating activities of SPLLC. Due to a continuing growth of revenues from Spirit and revised expectations of gaining business outside of the Spirit relationship, it was determined that Spirit is now the primary beneficiary of SPLLC.
Business Combination Equity Interest At Risk	$ 2.8
Variable Interes tEntity Extent Of Or Lack Of Recourse	Beneficial interest holders of SPLLC have no recourse to general credit or assets of Spirit
Variable Interest Entity Methodology For Determining Whether Enterprise Is Primary Beneficiary	Our analysis includes both quantitative and qualitative reviews. We base our quantitative analysis on the revenues for each customer or type of customer of the entity, and our qualitative analysis on our review of the design of the entity, its organizational structure, including decision-making ability, and relevant financial agreements. We also use our quantitative and qualitative analyses to determine if we must consolidate a variable interest entity as its primary beneficiary.

Name of the acquired entity.

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This element represents a description of the primary reason for the business combination which may consist of general categories such as top-line growth, synergistic benefits, market share, and diversification and the more detailed factors that might apply.

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- Definition

The degree to which creditors (or beneficial interest holders) of the Variable Interest Entity (VIE) have recourse against the general credit of the primary beneficiary.

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- Definition

Description of significant judgments and assumptions made by a reporting entity in determining whether it must: (1) consolidate a Variable Interest Entity (VIE) or (2) disclose information about its involvement in a VIE, and may include discussion of the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance is shared among multiple parties such that no one party is the primary beneficiary (as defined) or information about the types of involvements the reporting entity considers significant, supplemented with information about how the significant involvements were considered in determining whether the reporting entity is the primary beneficiary.

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