The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments - Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 30, 2018	Dec. 31, 2019	Mar. 31, 2019
Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			40.00%
Madison Paper Industries Owned Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			80.00%
Ownership of Madison Paper Industries by Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			50.00%
UPM-Kymmene \| Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			60.00%
Madison Paper Industries \| Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Noncontrolling interest, ownership percentage by parent			10.00%
Madison Paper Industries \| Madison Paper Industries Owned Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Noncontrolling interest, ownership percentage by parent			20.00%
Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Gain on sale of non-hydro power assets	$ 12.5
Forecast \| Madison Paper Industries \| Minimum
Schedule of Equity Method Investments [Line Items]
Gain on sale of non-hydro power assets		$ 5.0
Forecast \| Madison Paper Industries \| Maximum
Schedule of Equity Method Investments [Line Items]
Gain on sale of non-hydro power assets		$ 8.0