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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2018 USD ($) | Sep. 29, 2018 USD ($) shares | Sep. 30, 2017 USD ($) shares | Sep. 29, 2018 USD ($) shares | Sep. 30, 2017 USD ($) shares | Sep. 25, 2018 EUR (€) | Sep. 25, 2018 USD ($) | Mar. 31, 2018 USD ($) | Jul. 25, 2017 GBP (£) | Jul. 25, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amounts |  | $ 2,574.2 |  | $ 2,574.2 |  |  |  | $ 161.7 |  |
Anti-dilutive securities excluded from calculation of basic and diluted net income per ordinary share (in shares) | shares |  | 680,869 | 2,782,083 | 664,633 | 2,633,955 |  |  |  |  |
Cumulative effect of new accounting principal in period of adoption |  |  |  |  |  |  |  | 11.7 |  |
Return liabilities |  | $ 25.9 |  | $ 25.9 |  |  |  | 12.1 |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principal in period of adoption |  |  |  |  |  |  |  | 11.7 |  |
Retained Earnings | ASU 2017-12 |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principal in period of adoption | $ 0.1 |  |  |  |  |  |  |  |  |
Retained Earnings | ASU 2014-09 |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principal in period of adoption | 6.7 |  |  |  |  |  |  |  |  |
Tax amount on cumulative effect of new accounting principal | 1.7 |  |  |  |  |  |  |  |  |
Retained Earnings | ASU 2016-16 |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principal in period of adoption | $ 4.9 |  |  |  |  |  |  |  |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Prior period reclassification |  |  | $ (16.1) |  | $ (17.4) |  |  |  |  |
Restructuring and other charges |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Prior period reclassification |  |  | $ 16.1 |  | $ 17.4 |  |  |  |  |
Receivables, net | ASU 2014-09 |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Return liabilities |  | (16.3) |  | (16.3) |  |  |  |  |  |
Accrued expenses and other current liabilities | ASU 2014-09 |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Return liabilities |  | 16.3 |  | $ 16.3 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Forward contracts term, maximum (no more than) |  |  |  | 12 months |  |  |  |  |  |
Not Designated as Hedging Instrument | Forward foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amounts |  | $ 2,000.8 |  | $ 2,000.8 |  |  |  | $ 0.0 |  |
Gianni Versace S.p.A | Not Designated as Hedging Instrument | Forward foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  | € 1,680,000,000.00 | $ 2,001.0 |  |  |
Jimmy Cho PLC | Not Designated as Hedging Instrument | Forward foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  | £ 1,115,000,000.000 | $ 1,469.0

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