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Shareholders' Equity (Share Buyback Programs) (Details) - USD ($) | 11 Months Ended | 12 Months Ended | 38 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Apr. 30, 2017 | Mar. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |
Shares repurchased, amount |  | $ 30,722,000 | $ 83,786,000 | $ 70,358,000 |  |
Shares authorized for repurchase maximum voting share percent |  | 10.00% |  |  |  |
March 2014 program |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares approved (in shares) | 17,311,000 | 17,311,000 |  |  |  |
Shares approved, amount | $ 250,000,000 | $ 250,000,000 |  |  |  | $ 250,000,000.0
Shares repurchased (in shares) |  |  |  |  | 9,113,000 |
Shares repurchased, amount |  |  |  |  | $ 155,983,000 |
March 2017 program |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares approved (in shares) | 17,311,000 | 17,311,000 |  |  |  |
Shares approved, amount | $ 250,000,000 | $ 250,000,000 | $ 250,000,000.0 |  |  |
Shares repurchased (in shares) | 843,000 |  |  |  |  |
Shares repurchased, amount | $ 30,107,000 |  |  |  |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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