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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) shares | Oct. 01, 2016 shares | Sep. 30, 2017 USD ($) shares | Oct. 01, 2016 USD ($) shares | Jul. 25, 2017 GBP (£) | Apr. 01, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Excess tax deficit recognized in provision of income taxes | $ 5.0 |  | $ 0.1 |  |  |
Anti-dilutive securities excluded from calculation of basic and diluted net income per ordinary share (in shares) | shares | 2,782,083 | 2,000,778 | 2,633,955 | 2,049,980 |  |
Maximum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Forward contracts term, maximum (no more than) |  |  | 12 months |  |  |
Forward foreign currency exchange contracts |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Derivative notional amount | $ 1,645.2 |  | $ 1,645.2 |  |  | $ 167.5
Forward foreign currency exchange contracts | Not Designated as Hedging Instrument |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Derivative notional amount | $ 1,468.6 |  | $ 1,468.6 |  | £ 1,115,000,000.000 | $ 0.0
ASU 2016-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net cash provided by (used in) financing activities |  |  |  | $ (2.8) |  |
Net cash provided by (used in) operating activities |  |  |  | $ 2.8 |  |

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