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Fair Value Measurements (Tables) | 12 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Fair value of financial assets and liabilities measured and recorded at fair value on recurring basis | The following table summarizes the Company's financial assets and liabilities that are measured and recorded at fair value on a recurring basis, excluding accrued interest components:
|  | March 31, 2018 |  | April 1, 2017
|  | (millions)
Investments in commercial paper(a)(b) |  | $ | 234.2 |  |  | $ | — |
Derivative assets(a) |  | 12.3 |  |  | 32.6 |
Derivative liabilities(a) |  | 110.0 |  |  | 21.7 |
(a) | Based on Level 2 measurements.
(b) | $15.0 million included within cash and cash equivalents and $219.2 million included within short-term investments in the consolidated balance sheet as of March 31, 2018.
Carrying value and the estimated fair value of the Company's debt obligations | The following table summarizes the carrying values and the estimated fair values of the Company's debt instruments:
|  | March 31, 2018 |  | April 1, 2017
|  | Carrying Value |  | Fair Value(a) |  | Carrying Value |  | Fair Value(a)
|  | (millions)
$300 million 2.125% Senior Notes |  | $ | 298.1 |  | (b) | $ | 299.4 |  |  | $ | 298.1 |  | (b) | $ | 302.2 |
$300 million 2.625% Senior Notes |  | 288.0 |  | (b) | 298.7 |  |  | 290.1 |  | (b) | 302.8 |
Borrowings outstanding under credit facilities |  | 10.1 |  |  | 10.1 |  |  | — |  |  | — |
(a) | Based on Level 2 measurements.
(b) | See Note 11 for discussion of the carrying values of the Company's Senior Notes.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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