Line of Credit (Notes)	9 Months Ended
Sep. 25, 2016
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Line of Credit On December 19, 2014, we entered into a senior secured credit agreement (the "Credit Agreement") with J.P. Morgan Securities LLC, JP Morgan Chase Bank, N.A. (“JPMCB”) and Wells Fargo Bank, National Association (together with JPMCB, the “Lenders”). The Credit Agreement consists of a senior secured revolving credit facility in an initial aggregate principal amount of $100.0 million (the “Facility”). In addition, the company is entitled to request, subject to certain terms and conditions and the agreement of the Lenders, an increase in the aggregate revolving commitments under the Facility or to obtain incremental term loans in an aggregate amount not to exceed $50.0 million, which currently is uncommitted to by any lenders. As of September 25, 2016, the company had $97.2 million of availability under the Facility after giving effect to $2.8 million in outstanding letters of credit. The Credit Agreement expires on December 19, 2019 and borrowings under the Facility accrue interest at (i) a London interbank offered rate plus a margin of between 0.75 percent and 1.25 percent based on the total leverage ratio of Superior and its subsidiaries on a consolidated basis, (ii) a rate based on JPMCB’s prime rate plus a margin of between 0.00 percent and 0.25 percent based on the total leverage ratio of the company and its subsidiaries on a consolidated basis or (iii) a combination thereof. Commitment fees are 0.2 percent on the unused portion of the facility. The commitment fees are included as interest expense in our consolidated financial statements. Generally, all amounts under the Facility are guaranteed by certain of the U.S. subsidiaries of the company and are secured by a first priority security interest in and lien on the personal property of the company and the U.S. guarantors (as defined in the Credit Agreement) and a pledge of and first perfected security interest in the equity interests of the company’s existing and future U.S. subsidiaries and 65 percent of the equity interests in certain non-U.S. direct material subsidiaries of the company and the U.S. guarantors under the Facility. The Credit Agreement contains certain customary restrictive covenants, including, among others, financial covenants requiring the maintenance of a maximum total leverage ratio and a minimum fixed charge coverage ratio, and also includes, without limitation, covenants, in each case with certain exceptions and allowances, limiting the ability of the company and its subsidiaries to incur indebtedness, grant liens, make investments, dispose of assets, make certain restrictive payments, make optional payments and modifications of subordinated debt instruments, enter into certain transactions with affiliates, enter into swap agreements, make capital expenditures or make changes to its lines of business. At September 25, 2016, we were in compliance with all covenants contained in the Credit Agreement. At September 25, 2016, we had no borrowings under this facility other than the outstanding letters of credit referred to above. The Credit Agreement contains customary default provisions, representations and warranties and restrictive covenants. The Credit Agreement also contains a provision permitting the lenders to accelerate the repayment of all loans outstanding under the Facility during an event of default.

Line of Credit

On December 19, 2014, we entered into a senior secured credit agreement (the "Credit Agreement") with J.P. Morgan Securities LLC, JP Morgan Chase Bank, N.A. (“JPMCB”) and Wells Fargo Bank, National Association (together with JPMCB, the “Lenders”).

The Credit Agreement consists of a senior secured revolving credit facility in an initial aggregate principal amount of $100.0 million (the “Facility”). In addition, the company is entitled to request, subject to certain terms and conditions and the agreement of the Lenders, an increase in the aggregate revolving commitments under the Facility or to obtain incremental term loans in an aggregate amount not to exceed $50.0 million, which currently is uncommitted to by any lenders. As of September 25, 2016, the company had $97.2 million of availability under the Facility after giving effect to $2.8 million in outstanding letters of credit.

The Credit Agreement expires on December 19, 2019 and borrowings under the Facility accrue interest at (i) a London interbank offered rate plus a margin of between 0.75 percent and 1.25 percent based on the total leverage ratio of Superior and its subsidiaries on a consolidated basis, (ii) a rate based on JPMCB’s prime rate plus a margin of between 0.00 percent and 0.25 percent based on the total leverage ratio of the company and its subsidiaries on a consolidated basis or (iii) a combination thereof. Commitment fees are 0.2 percent on the unused portion of the facility. The commitment fees are included as interest expense in our consolidated financial statements.

Generally, all amounts under the Facility are guaranteed by certain of the U.S. subsidiaries of the company and are secured by a first priority security interest in and lien on the personal property of the company and the U.S. guarantors (as defined in the Credit Agreement) and a pledge of and first perfected security interest in the equity interests of the company’s existing and future U.S. subsidiaries and 65 percent of the equity interests in certain non-U.S. direct material subsidiaries of the company and the U.S. guarantors under the Facility.

The Credit Agreement contains certain customary restrictive covenants, including, among others, financial covenants requiring the maintenance of a maximum total leverage ratio and a minimum fixed charge coverage ratio, and also includes, without limitation, covenants, in each case with certain exceptions and allowances, limiting the ability of the company and its subsidiaries to incur indebtedness, grant liens, make investments, dispose of assets, make certain restrictive payments, make optional payments and modifications of subordinated debt instruments, enter into certain transactions with affiliates, enter into swap agreements, make capital expenditures or make changes to its lines of business. At September 25, 2016, we were in compliance with all covenants contained in the Credit Agreement. At September 25, 2016, we had no borrowings under this facility other than the outstanding letters of credit referred to above.

The Credit Agreement contains customary default provisions, representations and warranties and restrictive covenants. The Credit Agreement also contains a provision permitting the lenders to accelerate the repayment of all loans outstanding under the Facility during an event of default.