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Recently Issued Accounting Pronouncements - Topic 606 (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Apr. 01, 2018 | Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Net sales | $ 1,432.5 | $ 1,012.1 |  | $ 2,644.9 | $ 1,984.3 |  |  |
Cost of Sales | 743.2 | 398.0 | [1] | 1,313.6 | 785.8 | [1] |  |
Gross Profit | 689.3 | 614.1 |  | 1,331.3 | 1,198.5 |  |  |
Income tax benefit | (135.7) | (3.0) |  | (133.7) | (7.3) |  |  |
Net income | 96.3 | $ 189.2 |  | 132.0 | $ 359.7 |  |  |
Accounts receivable, net | 668.8 |  |  | 668.8 |  |  | $ 518.1 | $ 563.7
Inventories | 836.7 |  |  | 836.7 |  |  | 471.1 | 476.2
Other current assets | 206.5 |  |  | 206.5 |  |  | 137.0 | 119.8
Long-term deferred tax assets | 1,715.5 |  |  | 1,715.5 |  |  | 1,656.5 | 100.2
Accrued liabilities | 481.9 |  |  | 481.9 |  |  | 248.1 | 229.6
Deferred income on shipments to distributors | 0.0 |  |  | 0.0 |  |  | 0.0 | 333.8
Long-term deferred tax liability | 815.4 |  |  | 815.4 |  |  | 221.5 | 205.8
Retained earnings | 3,159.6 |  |  | 3,159.6 |  |  | $ 3,199.0 | 1,397.3
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  | (45.6)
Inventories |  |  |  |  |  |  |  | (5.1)
Other current assets |  |  |  |  |  |  |  | 17.2
Long-term deferred tax assets |  |  |  |  |  |  |  | (23.1)
Accrued liabilities |  |  |  |  |  |  |  | 18.5
Deferred income on shipments to distributors |  |  |  |  |  |  |  | (333.8)
Long-term deferred tax liability |  |  |  |  |  |  |  | 16.8
Retained earnings |  |  |  |  |  |  |  | $ 241.9
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Net sales | 1,437.6 |  |  | 2,647.5 |  |  |  |
Cost of Sales | 747.6 |  |  | 1,319.2 |  |  |  |
Gross Profit | 690.0 |  |  | 1,328.3 |  |  |  |
Income tax benefit | (133.0) |  |  | (133.3) |  |  |  |
Net income | 94.3 |  |  | 128.6 |  |  |  |
Accounts receivable, net | 706.3 |  |  | 706.3 |  |  |  |
Inventories | 841.8 |  |  | 841.8 |  |  |  |
Other current assets | 188.1 |  |  | 188.1 |  |  |  |
Long-term deferred tax assets | 1,739.3 |  |  | 1,739.3 |  |  |  |
Accrued liabilities | 458.6 |  |  | 458.6 |  |  |  |
Deferred income on shipments to distributors | 332.4 |  |  | 332.4 |  |  |  |
Long-term deferred tax liability | 798.6 |  |  | 798.6 |  |  |  |
Retained earnings | 2,915.3 |  |  | 2,915.3 |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Net sales | (5.1) |  |  | (2.6) |  |  |  |
Cost of Sales | (4.4) |  |  | (5.6) |  |  |  |
Gross Profit | (0.7) |  |  | 3.0 |  |  |  |
Income tax benefit | (2.7) |  |  | (0.4) |  |  |  |
Net income | 2.0 |  |  | 3.4 |  |  |  |
Accounts receivable, net | (37.5) |  |  | (37.5) |  |  |  |
Inventories | (5.1) |  |  | (5.1) |  |  |  |
Other current assets | 18.4 |  |  | 18.4 |  |  |  |
Long-term deferred tax assets | (23.8) |  |  | (23.8) |  |  |  |
Accrued liabilities | 23.3 |  |  | 23.3 |  |  |  |
Deferred income on shipments to distributors | (332.4) |  |  | (332.4) |  |  |  |
Long-term deferred tax liability | 16.8 |  |  | 16.8 |  |  |  |
Retained earnings | $ 244.3 |  |  | $ 244.3 |  |  |  |
[1] | (1) Includes share-based compensation expense as follows: Cost of sales$3.9 $3.7 $7.5 $7.1Research and development$19.7 $10.6 $33.8 $20.9Selling, general and administrative$17.8 $9.3 $29.5 $18.0Special charges and other, net$1.2 $— $17.1 $—

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