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Summary of Significant Accounting Policies (Details Textual) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 29, 2018 USD ($) Customer | Sep. 29, 2018 USD ($) Customer | Mar. 31, 2018 USD ($) | Apr. 01, 2018 USD ($) | Sep. 30, 2017 USD ($)
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Deferred income | $ 20.0 | $ 20.0 | $ 31.7 |  |
Amount of revenue recognized that was previously reported as deferred income | $ 1.6 | $ 14.9 |  |  |
Deferred income, impact of adoption of ASU 2014-09 |  |  |  | $ (6.1) |
Wholesale customer payment terms |  | 30 to 120 days |  |  |
Number Of Key Department Store Customers | Customer | 3 | 3 |  |  |
Inventory, Net | $ 994.6 | $ 994.6 | $ 761.3 |  | $ 864.6
Total Net Revenue [Member] |  |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Contribution of Key Wholesale Customers |  |  | 19.00% |  |
Accounts Receivable [Member] |  |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Contribution of Key Wholesale Customers |  | 34.00% |  |  |
Macy's [Member] | Total Net Revenue [Member] |  |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Contribution of Key Wholesale Customers |  |  | 8.00% |  |

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