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Stockholders' Equity - Repurchase Programs (Details) - USD ($) | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 17, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 31, 2019 | Oct. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |
Dollar value of shares that may yet be repurchased |  | $ 350,212,000 |  |  |  |
Repurchased stock acquired average cost per share (in dollars per share) |  | $ 115.22 | $ 87.91 | $ 56.51 |  |
Shares repurchased (in shares) |  | 1,400,699 | 1,702,653 | 222,471 |  |
Dollar value of shares repurchased |  | $ 161,395,000 | $ 149,687,000 | $ 12,572,000 |  |
2015 And 2017 Stock Repurchase Plans |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Authorized amount of shares to repurchase |  |  |  |  |  | $ 400,294,000
2017 Stock Repurchase Program |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dollar value of shares that may yet be repurchased |  | $ 89,212,000 |  |  |  |
2019 Stock Repurchase Plan |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Authorized amount of shares to repurchase |  |  |  |  | $ 261,000,000 |
Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares repurchased (in shares) | 0 |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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