Summary of Significant Accounting Policies	12 Months Ended
Dec. 29, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations Wolverine World Wide, Inc. (the “Company”) is a leading designer, marketer and licensor of a broad range of quality casual footwear and apparel; performance outdoor and athletic footwear and apparel; kids' footwear; industrial work shoes, boots and apparel; and uniform shoes and boots. The Company’s portfolio of owned and licensed brands includes: Bates^®, Cat^®, Chaco^®, Harley-Davidson^®, Hush Puppies^®, HyTest^®, Keds^®, Merrell^®, Saucony^®, Sperry^®, Stride Rite^® and Wolverine^®. Licensing and distribution arrangements with third parties extend the global reach of the Company’s brand portfolio. The Company also operates a consumer-direct division to market both its own brands and branded footwear and apparel from other manufacturers, as well as a leathers division that markets Wolverine Performance Leathers™. Principles of Consolidation The consolidated financial statements include the accounts of Wolverine World Wide, Inc. and its majority-owned subsidiaries (collectively, the “Company”). All intercompany accounts and transactions have been eliminated in consolidation. Fiscal Year The Company’s fiscal year is the 52- or 53-week period that ends on the Saturday nearest to December 31. Fiscal years 2018, 2017 and 2016 all had 52 weeks. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Revenue Recognition Effective December 31, 2017, the Company adopted ASU 2014-09, Revenue from Contracts with Customers, using the modified retrospective method. Under the modified retrospective method, the impact of applying the standard is recognized as a cumulative effect on retained earnings. The adoption of ASU 2014-09 did not have a material impact on the Company’s consolidated financial position, results of operations, equity or cash flows as of the adoption date or for the year ended December 29, 2018. Comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. For additional information, refer to Note 6. Cost of Goods Sold Cost of goods sold includes the actual product costs, including inbound freight charges and certain outbound freight charges, purchasing, sourcing, inspection and receiving costs. Warehousing costs are included in selling, general and administrative expenses. Shipping and Handling Costs Shipping and handling costs that are charged to and reimbursed by a customer are recognized as revenue, while the related expenses incurred by the Company are recorded as cost of goods sold. Advertising Costs Advertising costs are expensed as incurred, except for certain materials that are expensed the first time that the advertising takes place. Advertising expenses were $120.8 million, $107.1 million and $121.5 million for fiscal years 2018, 2017 and 2016, respectively. Prepaid advertising totaled $1.5 million and $2.8 million as of December 29, 2018 and December 30, 2017, respectively. Cash Equivalents Cash equivalents include highly liquid investments with an original maturity of three months or less. Cash equivalents are stated at cost, which approximates market. Allowance for Uncollectible Accounts The Company maintains an allowance for uncollectible accounts receivable for estimated losses resulting from its customers’ failure to make required payments. Company management evaluates the allowance for uncollectible accounts receivable based on a review of current customer status and historical collection experience. Inventories The Company values its inventory at the lower of cost or net realizable value. Cost is determined by the LIFO method for certain domestic finished goods inventories. Cost is determined using the FIFO method for all raw materials, work-in-process and finished goods inventories in foreign countries; certain domestic finished goods inventories; and for all finished goods inventories of the Company’s consumer-direct business, due to the unique nature of those operations. The Company has applied these inventory cost valuation methods consistently from year to year. The Company reduces the carrying value of its inventories to the lower of cost or net realizable value for excess or obsolete inventories based upon assumptions about future demand and market conditions. If the Company were to determine that the estimated realizable value of its inventory is less than the carrying value of such inventory, the Company would provide a reserve for such difference as a charge to cost of sales. If actual market conditions are different from those projected, adjustments to those inventory reserves may be required. The adjustments would increase or decrease the Company’s cost of sales and net income in the period in which they were realized or recorded. Inventory quantities are verified at various times throughout the year by performing physical inventory counts and subsequently comparing those results to perpetual inventory balances. If the Company determines that adjustments to the inventory quantities are appropriate, an adjustment to the Company’s cost of goods sold and inventory is recorded in the period in which such determination was made. Property, Plant and Equipment Property, plant and equipment are stated on the basis of cost and include expenditures for computer hardware and software, store furniture and fixtures, office furniture and machinery and equipment. Normal repairs and maintenance are expensed as incurred. Depreciation of property, plant and equipment is computed using the straight-line method. The depreciable lives range from 14 to 20 years for buildings and improvements, from 5 to 10 years for leasehold improvements and from 3 to 10 years for machinery, equipment and software. Operating Leases The Company leases its retail stores and certain distribution and office facilities under operating leases. In addition to the minimum lease payments, leases may include rent escalation clauses, contingent rental expense and lease incentives, including rent holidays and tenant improvement allowances. Rent expense is recognized on a straight-line basis over the term of the lease from the time at which the Company takes possession of the property. Landlord-provided tenant improvement allowances are recorded in other liabilities and amortized as a credit to rent expense over the term of the lease. Leasehold improvements are depreciated at the lesser of the estimated useful life or lease term, including reasonably-assured lease renewals as determined at lease inception. Deferred Financing Costs Deferred financing costs represent commitment fees, legal and other third-party costs associated with obtaining commitments for financing that result in a closing of such financings for the Company. Deferred financing costs related to fixed term borrowings are recorded as a reduction of long-term debt in the consolidated balance sheet. Deferred financing costs related to revolving credit facilities are recorded as an other noncurrent asset in the consolidated balance sheet. These costs are amortized into earnings through interest expense over the terms of the respective agreements. Costs incurred in seeking financing transactions that do not close are expensed in the period in which it is determined that the financing will not close. Goodwill and Other Intangibles Goodwill represents the excess of the purchase price over the fair value of net tangible and identifiable intangible assets of acquired businesses. Indefinite-lived intangibles include trademarks and trade names. Goodwill and intangible assets deemed to have indefinite lives are not amortized, but are subject to impairment tests at least annually. The Company reviews the carrying amounts of goodwill and indefinite-lived intangible assets by reporting unit at least annually, or when indicators of impairment are present, to determine if such assets may be impaired. The Company includes assumptions about expected future operating performance as part of a discounted cash flow analysis to estimate fair value. If the carrying value of these assets is not recoverable, based on the discounted cash flow analysis, management performs the next step, which compares the fair value of the reporting unit to the carrying value of the tangible and intangible net assets of the reporting units. Goodwill is considered impaired if the recorded value of the tangible and intangible net assets exceeds the fair value of the reporting unit. The Company may first assess qualitative factors to determine whether it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying value. The Company would not be required to quantitatively determine the fair value of the indefinite-lived intangible unless the Company determines, based on the qualitative assessment, that it is more likely than not that its fair value is less than the carrying value. The Company may skip the qualitative assessment and quantitatively test indefinite-lived intangibles by comparison of the individual carrying values to the fair values. Future cash flows of the individual indefinite-lived intangible assets are used to measure their fair value after consideration by management of certain assumptions, such as forecasted growth rates and cost of capital, which are derived from internal projections and operating plans. The Company performs its annual testing for goodwill and indefinite-lived intangible asset impairment at the beginning of the fourth quarter of the fiscal year. See Note 4 to the consolidated financial statements for information related to the results of the Company's annual test. Impairment of Long-Lived Assets The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or an asset group may not be recoverable. Each impairment test is based on a comparison of the carrying amount of the asset or asset group to the future undiscounted net cash flows expected to be generated by the asset or asset group. If such assets are considered to be impaired, the impairment amount to be recognized is the amount by which the carrying value of the assets exceeds their fair value. Environmental Environmental costs relating to existing conditions caused by past operations that do not contribute to current or future revenues are expensed as incurred. Liabilities related to estimated remediation costs are recorded on an undiscounted basis when they are probable and reasonably estimable, generally no later than the completion of feasibility studies, the Company’s commitment to a plan of action, or approval by regulatory agencies. Retirement Benefits The determination of the obligation and expense for retirement benefits is dependent on the selection of certain actuarial assumptions used in calculating such amounts. These assumptions include, among others, the discount rate, expected long-term rate of return on plan assets, mortality rates and rates of increase in compensation. These assumptions are reviewed with the Company’s actuaries and updated annually based on relevant external and internal factors and information, including, but not limited to, long-term expected asset returns, rates of termination, regulatory requirements and plan changes. See Note 12 to the consolidated financial statements for additional information. The Company has elected to measure its defined benefit plan assets and obligations as of December 31 of each year, regardless of the Company's actual fiscal year end date, which is the Saturday nearest to December 31. Income Taxes The provision for income taxes is based on the geographic dispersion of the earnings reported in the consolidated financial statements. A deferred income tax asset or liability is determined by applying currently-enacted tax laws and rates to the cumulative temporary differences between the carrying values of assets and liabilities for financial statement and income tax purposes. The Company records an increase in liabilities for income tax accruals associated with tax benefits claimed on tax returns but not recognized for financial statement purposes (unrecognized tax benefits). The Company recognizes interest and penalties related to unrecognized tax benefits through interest expense and income tax expense, respectively. Foreign Currency For most of the Company’s international subsidiaries, the local currency is the functional currency. Assets and liabilities of these subsidiaries are translated into U.S. dollars at the year-end exchange rate. Operating statement amounts are translated at average exchange rates for each period. The cumulative translation adjustments resulting from changes in exchange rates are included in the consolidated balance sheets as a component of accumulated other comprehensive income (loss) in stockholders’ equity. Transaction gains and losses are included in the consolidated statements of operations and were not material for fiscal years 2018, 2017 and 2016.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations

Wolverine World Wide, Inc. (the “Company”) is a leading designer, marketer and licensor of a broad range of quality casual footwear and apparel; performance outdoor and athletic footwear and apparel; kids' footwear; industrial work shoes, boots and apparel; and uniform shoes and boots. The Company’s portfolio of owned and licensed brands includes: Bates^®, Cat^®, Chaco^®, Harley-Davidson^®, Hush Puppies^®, HyTest^®, Keds^®, Merrell^®, Saucony^®, Sperry^®, Stride Rite^® and Wolverine^®. Licensing and distribution arrangements with third parties extend the global reach of the Company’s brand portfolio. The Company also operates a consumer-direct division to market both its own brands and branded footwear and apparel from other manufacturers, as well as a leathers division that markets Wolverine Performance Leathers™.

Principles of Consolidation

The consolidated financial statements include the accounts of Wolverine World Wide, Inc. and its majority-owned subsidiaries (collectively, the “Company”). All intercompany accounts and transactions have been eliminated in consolidation.

Fiscal Year

The Company’s fiscal year is the 52- or 53-week period that ends on the Saturday nearest to December 31. Fiscal years 2018, 2017 and 2016 all had 52 weeks.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.

Revenue Recognition

Effective December 31, 2017, the Company adopted ASU 2014-09, Revenue from Contracts with Customers, using the modified retrospective method. Under the modified retrospective method, the impact of applying the standard is recognized as a cumulative effect on retained earnings. The adoption of ASU 2014-09 did not have a material impact on the Company’s consolidated financial position, results of operations, equity or cash flows as of the adoption date or for the year ended December 29, 2018. Comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. For additional information, refer to Note 6.

Cost of Goods Sold

Cost of goods sold includes the actual product costs, including inbound freight charges and certain outbound freight charges, purchasing, sourcing, inspection and receiving costs. Warehousing costs are included in selling, general and administrative expenses.

Shipping and Handling Costs

Shipping and handling costs that are charged to and reimbursed by a customer are recognized as revenue, while the related expenses incurred by the Company are recorded as cost of goods sold.

Advertising Costs

Advertising costs are expensed as incurred, except for certain materials that are expensed the first time that the advertising takes place. Advertising expenses were $120.8 million, $107.1 million and $121.5 million for fiscal years 2018, 2017 and 2016, respectively. Prepaid advertising totaled $1.5 million and $2.8 million as of December 29, 2018 and December 30, 2017, respectively.

Cash Equivalents

Cash equivalents include highly liquid investments with an original maturity of three months or less. Cash equivalents are stated at cost, which approximates market.

Allowance for Uncollectible Accounts

The Company maintains an allowance for uncollectible accounts receivable for estimated losses resulting from its customers’ failure to make required payments. Company management evaluates the allowance for uncollectible accounts receivable based on a review of current customer status and historical collection experience.

Inventories

The Company values its inventory at the lower of cost or net realizable value. Cost is determined by the LIFO method for certain domestic finished goods inventories. Cost is determined using the FIFO method for all raw materials, work-in-process and finished goods inventories in foreign countries; certain domestic finished goods inventories; and for all finished goods inventories of the Company’s consumer-direct business, due to the unique nature of those operations. The Company has applied these inventory cost valuation methods consistently from year to year.

The Company reduces the carrying value of its inventories to the lower of cost or net realizable value for excess or obsolete inventories based upon assumptions about future demand and market conditions. If the Company were to determine that the estimated realizable value of its inventory is less than the carrying value of such inventory, the Company would provide a reserve for such difference as a charge to cost of sales. If actual market conditions are different from those projected, adjustments to those inventory reserves may be required. The adjustments would increase or decrease the Company’s cost of sales and net income in the period in which they were realized or recorded. Inventory quantities are verified at various times throughout the year by performing physical inventory counts and subsequently comparing those results to perpetual inventory balances. If the Company determines that adjustments to the inventory quantities are appropriate, an adjustment to the Company’s cost of goods sold and inventory is recorded in the period in which such determination was made.

Property, Plant and Equipment

Property, plant and equipment are stated on the basis of cost and include expenditures for computer hardware and software, store furniture and fixtures, office furniture and machinery and equipment. Normal repairs and maintenance are expensed as incurred.

Depreciation of property, plant and equipment is computed using the straight-line method. The depreciable lives range from 14 to 20 years for buildings and improvements, from 5 to 10 years for leasehold improvements and from 3 to 10 years for machinery, equipment and software.

Operating Leases

The Company leases its retail stores and certain distribution and office facilities under operating leases. In addition to the minimum lease payments, leases may include rent escalation clauses, contingent rental expense and lease incentives, including rent holidays and tenant improvement allowances. Rent expense is recognized on a straight-line basis over the term of the lease from the time at which the Company takes possession of the property. Landlord-provided tenant improvement allowances are recorded in other liabilities and amortized as a credit to rent expense over the term of the lease. Leasehold improvements are depreciated at the lesser of the estimated useful life or lease term, including reasonably-assured lease renewals as determined at lease inception.

Deferred Financing Costs

Deferred financing costs represent commitment fees, legal and other third-party costs associated with obtaining commitments for financing that result in a closing of such financings for the Company. Deferred financing costs related to fixed term borrowings are recorded as a reduction of long-term debt in the consolidated balance sheet. Deferred financing costs related to revolving credit facilities are recorded as an other noncurrent asset in the consolidated balance sheet. These costs are amortized into earnings through interest expense over the terms of the respective agreements. Costs incurred in seeking financing transactions that do not close are expensed in the period in which it is determined that the financing will not close.

Goodwill and Other Intangibles

Goodwill represents the excess of the purchase price over the fair value of net tangible and identifiable intangible assets of acquired businesses. Indefinite-lived intangibles include trademarks and trade names. Goodwill and intangible assets deemed to have indefinite lives are not amortized, but are subject to impairment tests at least annually. The Company reviews the carrying amounts of goodwill and indefinite-lived intangible assets by reporting unit at least annually, or when indicators of impairment are present, to determine if such assets may be impaired. The Company includes assumptions about expected future operating performance as part of a discounted cash flow analysis to estimate fair value. If the carrying value of these assets is not recoverable, based on the discounted cash flow analysis, management performs the next step, which compares the fair value of the reporting unit to the carrying value of the tangible and intangible net assets of the reporting units. Goodwill is considered impaired if the recorded value of the tangible and intangible net assets exceeds the fair value of the reporting unit.

The Company may first assess qualitative factors to determine whether it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying value. The Company would not be required to quantitatively determine the fair value of the indefinite-lived intangible unless the Company determines, based on the qualitative assessment, that it is more likely than not that its fair value is less than the carrying value. The Company may skip the qualitative assessment and quantitatively test indefinite-lived intangibles by comparison of the individual carrying values to the fair values. Future cash flows of the individual indefinite-lived intangible assets are used to measure their fair value after consideration by management of certain assumptions, such as forecasted growth rates and cost of capital, which are derived from internal projections and operating plans.

The Company performs its annual testing for goodwill and indefinite-lived intangible asset impairment at the beginning of the fourth quarter of the fiscal year. See Note 4 to the consolidated financial statements for information related to the results of the Company's annual test.

Impairment of Long-Lived Assets

The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or an asset group may not be recoverable. Each impairment test is based on a comparison of the carrying amount of the asset or asset group to the future undiscounted net cash flows expected to be generated by the asset or asset group. If such assets are considered to be impaired, the impairment amount to be recognized is the amount by which the carrying value of the assets exceeds their fair value.

Environmental

Environmental costs relating to existing conditions caused by past operations that do not contribute to current or future revenues are expensed as incurred. Liabilities related to estimated remediation costs are recorded on an undiscounted basis when they are probable and reasonably estimable, generally no later than the completion of feasibility studies, the Company’s commitment to a plan of action, or approval by regulatory agencies.

Retirement Benefits

The determination of the obligation and expense for retirement benefits is dependent on the selection of certain actuarial assumptions used in calculating such amounts. These assumptions include, among others, the discount rate, expected long-term rate of return on plan assets, mortality rates and rates of increase in compensation. These assumptions are reviewed with the Company’s actuaries and updated annually based on relevant external and internal factors and information, including, but not limited to, long-term expected asset returns, rates of termination, regulatory requirements and plan changes. See Note 12 to the consolidated financial statements for additional information. The Company has elected to measure its defined benefit plan assets and obligations as of December 31 of each year, regardless of the Company's actual fiscal year end date, which is the Saturday nearest to December 31.

Income Taxes

The provision for income taxes is based on the geographic dispersion of the earnings reported in the consolidated financial statements. A deferred income tax asset or liability is determined by applying currently-enacted tax laws and rates to the cumulative temporary differences between the carrying values of assets and liabilities for financial statement and income tax purposes.

The Company records an increase in liabilities for income tax accruals associated with tax benefits claimed on tax returns but not recognized for financial statement purposes (unrecognized tax benefits). The Company recognizes interest and penalties related to unrecognized tax benefits through interest expense and income tax expense, respectively.

Foreign Currency

For most of the Company’s international subsidiaries, the local currency is the functional currency. Assets and liabilities of these subsidiaries are translated into U.S. dollars at the year-end exchange rate. Operating statement amounts are translated at average exchange rates for each period. The cumulative translation adjustments resulting from changes in exchange rates are included in the consolidated balance sheets as a component of accumulated other comprehensive income (loss) in stockholders’ equity. Transaction gains and losses are included in the consolidated statements of operations and were not material for fiscal years 2018, 2017 and 2016.