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Stockholders' Equity (Narrative) (Details) | 12 Months Ended
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Mar. 31, 2018 USD ($) vote / shares $ / shares shares | Mar. 31, 2017 $ / shares shares
Class of Stock [Line Items] |  |
Common stock, shares authorized (in shares) | shares | 250,000,000 | 250,000,000
Common stock, par value (in USD per share) | $ / shares | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) | shares | 5,000,000 | 5,000,000
Preferred stock, par value (in USD per share) | $ / shares | $ 0.01 | $ 0.01
Voting rights, number of votes per common share owned | vote / shares | 1 |
Dividends declared on common stock | $ | $ 0 |
Restricted Shares |  |
Class of Stock [Line Items] |  |
Restricted stock repurchased during period (in shares) | shares | 20,549 | 25,768
Restricted stock acquired, average cost per share (in USD per share) | $ / shares | $ 52.33 | $ 55.51

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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