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Basis of Presentation - Accounting Pronouncements Adopted (Details) - ASU 2016-01 - Investments $ in Millions | 3 Months Ended
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Jul. 28, 2018 USD ($)
Retained Earnings |
Accounting pronouncements adopted in fiscal 2019 |
Reclassification of net unrealized gains, before tax | $ 2.1
Reclassification of tax expense | 0.5
Accumulated Other Comprehensive Income (Loss) |
Accounting pronouncements adopted in fiscal 2019 |
Reclassification of net unrealized gains, before tax | (2.1)
Reclassification of tax expense | $ (0.5)

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