New accounting standards (Policies)	9 Months Ended
Sep. 25, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New accounting standards	New accounting standards In May 2014, the Financial Accounting Standards Board ("FASB"), in a joint effort with the International Accounting Standards Board ("IASB"), issued new accounting guidance to clarify the principles for recognizing revenue. The new guidance is designed to enhance the comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets, and will affect any entity that enters into contracts with customers or enters into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards. The new guidance establishes principles for reporting information to users of financial statements about the nature, amount, timing, and uncertainty of revenue and cash flows arising from an entity's contracts with customers. The core principle of the new guidance is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. In August 2015, the FASB issued an amendment to the new guidance that deferred the effective date. The amendment provides that the new guidance is effective for annual periods beginning after December 15, 2017 and interim periods within those years; early application is permitted for annual periods beginning after December 15, 2016. The Company is currently evaluating this guidance to determine its impact on the Company’s results of operations, cash flows and financial position. In April 2015, the FASB issued guidance for the reporting of debt issuance costs within the balance sheet. Under the new guidance, debt issuance costs related to term loans are to be presented in the balance sheet as a direct deduction from the associated debt liability, consistent with the presentation of a debt discount. Previously, debt issuance costs were presented as a deferred charge (i.e., an asset) on the balance sheet. The guidance provides uniform treatment for debt issuance costs and debt discounts and eliminates inconsistencies that previously existed with other FASB guidance. The Company retrospectively adopted this guidance as of January 1, 2016. In February 2016, the FASB issued guidance that will change the requirements for accounting for leases. The principal change under the new accounting guidance is that lessees under leases classified as operating leases will recognize a right-of-use asset and a lease liability. Current lease accounting does not require lessees to recognize assets and liabilities arising under operating leases on the balance sheet. Under the new guidance, lessees (including lessees under leases classified as finance leases and operating leases) will recognize a right-to-use asset and a lease liability on the balance sheet, initially measured as the present value of lease payments under the lease. Expense recognition and cash flow presentation guidance will be based upon whether the lease is classified as an operating lease or a finance lease (the classification criteria for distinguishing between finance leases and operating leases is substantially similar to the classification criteria for distinguishing between capital leases and operating leases under current guidance). The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition approach for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements; the guidance provides certain practical expedients. The Company is currently evaluating this guidance to determine its impact on the Company’s results of operations, cash flows and financial position. In March 2016, the FASB issued new guidance designed to simplify several aspects of the accounting for share-based payment transactions, including guidance providing generally that excess tax benefits related to share-based awards should be recorded as a reduction to income tax expense (currently, excess tax benefits generally are recorded as additional-paid-in-capital) and addressing other, related guidance on accounting for income taxes with respect to share-based payment awards; providing generally that excess tax benefits related to share-based awards should be classified along with other income tax cash flows as an operating activity (currently, excess tax benefits generally are separated from other income tax cash flows and classified as a financing activity); providing that an entity may make an accounting policy election either to base compensation cost accruals on the number of awards expected to vest (as required by current guidance) or to account for forfeitures when they occur; modifying the current exception to liability classification such that partial cash settlement of an award for tax withholding purposes would not result, by itself, in liability classification of the award if the amount withheld does not exceed the maximum statutory tax rate in the employees' applicable jurisdictions (currently, an award cannot qualify for equity classification, rather than liability classification, if the amount withheld exceeds the minimum statutory withholding requirements); and providing that cash paid by an employer when directly withholding shares for tax withholding purposes should be classified as a financing activity on the statement of cash flows (currently there is no authoritative guidance addressing this classification issue). The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted (if early adoption occurs in an interim period, any adjustments will be reflected as of the beginning of the fiscal year that includes the interim period). Depending on the particular issue addressed by the guidance, application of the guidance will be made prospectively, retrospectively or subject to a retrospective transition method. We are currently evaluating the potential impact of adopting this guidance on the Company's results of operations, cash flows and financial position. In August 2016, the FASB issued new guidance on the classification of certain cash receipts and cash payments within the statement of cash flows. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. Early adoption is permitted, including adoption in an interim period. The new guidance should be adopted using a retrospective transition method for each period presented; if it is impractical to apply the new standard retrospectively for some of the issues addressed by the new guidance, application of the new guidance with respect to those issues would be made prospectively as of the earliest date practicable. The Company is currently evaluating this guidance to determine its impact on the Company’s cash flows. From time to time, new accounting guidance is issued by the FASB or other standard setting bodies that is adopted by the Company as of the effective date or, in some cases where early adoption is permitted, in advance of the effective date. The Company has assessed the recently issued guidance that is not yet effective and, unless otherwise indicated above, believes the new guidance will not have a material impact on the Company’s results of operations, cash flows or financial position.

New accounting standards

In May 2014, the Financial Accounting Standards Board ("FASB"), in a joint effort with the International Accounting Standards Board ("IASB"), issued new accounting guidance to clarify the principles for recognizing revenue. The new guidance is designed to enhance the comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets, and will affect any entity that enters into contracts with customers or enters into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards. The new guidance establishes principles for reporting information to users of financial statements about the nature, amount, timing, and uncertainty of revenue and cash flows arising from an entity's contracts with customers. The core principle of the new guidance is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. In August 2015, the FASB issued an amendment to the new guidance that deferred the effective date. The amendment provides that the new guidance is effective for annual periods beginning after December 15, 2017 and interim periods within those years; early application is permitted for annual periods beginning after December 15, 2016. The Company is currently evaluating this guidance to determine its impact on the Company’s results of operations, cash flows and financial position.

In April 2015, the FASB issued guidance for the reporting of debt issuance costs within the balance sheet. Under the new guidance, debt issuance costs related to term loans are to be presented in the balance sheet as a direct deduction from the associated debt liability, consistent with the presentation of a debt discount. Previously, debt issuance costs were presented as a deferred charge (i.e., an asset) on the balance sheet. The guidance provides uniform treatment for debt issuance costs and debt discounts and eliminates inconsistencies that previously existed with other FASB guidance. The Company retrospectively adopted this guidance as of January 1, 2016.

In February 2016, the FASB issued guidance that will change the requirements for accounting for leases. The principal change under the new accounting guidance is that lessees under leases classified as operating leases will recognize a right-of-use asset and a lease liability. Current lease accounting does not require lessees to recognize assets and liabilities arising under operating leases on the balance sheet. Under the new guidance, lessees (including lessees under leases classified as finance leases and operating leases) will recognize a right-to-use asset and a lease liability on the balance sheet, initially measured as the present value of lease payments under the lease. Expense recognition and cash flow presentation guidance will be based upon whether the lease is classified as an operating lease or a finance lease (the classification criteria for distinguishing between finance leases and operating leases is substantially similar to the classification criteria for distinguishing between capital leases and operating leases under current guidance). The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition approach for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements; the guidance provides certain practical expedients. The Company is currently evaluating this guidance to determine its impact on the Company’s results of operations, cash flows and financial position.

In March 2016, the FASB issued new guidance designed to simplify several aspects of the accounting for share-based payment transactions, including guidance providing generally that excess tax benefits related to share-based awards should be recorded as a reduction to income tax expense (currently, excess tax benefits generally are recorded as additional-paid-in-capital) and addressing other, related guidance on accounting for income taxes with respect to share-based payment awards; providing generally that excess tax benefits related to share-based awards should be classified along with other income tax cash flows as an operating activity (currently, excess tax benefits generally are separated from other income tax cash flows and classified as a financing activity); providing that an entity may make an accounting policy election either to base compensation cost accruals on the number of awards expected to vest (as required by current guidance) or to account for forfeitures when they occur; modifying the current exception to liability classification such that partial cash settlement of an award for tax withholding purposes would not result, by itself, in liability classification of the award if the amount withheld does not exceed the maximum statutory tax rate in the employees' applicable jurisdictions (currently, an award cannot qualify for equity classification, rather than liability classification, if the amount withheld exceeds the minimum statutory withholding requirements); and providing that cash paid by an employer when directly withholding shares for tax withholding purposes should be classified as a financing activity on the statement of cash flows (currently there is no authoritative guidance addressing this classification issue). The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted (if early adoption occurs in an interim period, any adjustments will be reflected as of the beginning of the fiscal year that includes the interim period). Depending on the particular issue addressed by the guidance, application of the guidance will be made prospectively, retrospectively or subject to a retrospective transition method. We are currently evaluating the potential impact of adopting this guidance on the Company's results of operations, cash flows and financial position.

In August 2016, the FASB issued new guidance on the classification of certain cash receipts and cash payments within the statement of cash flows. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. Early adoption is permitted, including adoption in an interim period. The new guidance should be adopted using a retrospective transition method for each period presented; if it is impractical to apply the new standard retrospectively for some of the issues addressed by the new guidance, application of the new guidance with respect to those issues would be made prospectively as of the earliest date practicable. The Company is currently evaluating this guidance to determine its impact on the Company’s cash flows.

From time to time, new accounting guidance is issued by the FASB or other standard setting bodies that is adopted by the Company as of the effective date or, in some cases where early adoption is permitted, in advance of the effective date. The Company has assessed the recently issued guidance that is not yet effective and, unless otherwise indicated above, believes the new guidance will not have a material impact on the Company’s results of operations, cash flows or financial position.