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Stockholders' Equity - Stock Appreciation Rights (Details) - 2007 LTIP SARs - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |
Maximum contractual term of SARs with final vesting date of December 31, 2011 (in years) | 10 years |  |  |
Maximum contractual term of SARs with final vesting date of December 31, 2016 (in years) | 15 years |  |  |
Stock Incentive Plan 2015 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |
Stock appreciation rights issued | 0 |  |  |
Equity Incentive Plans 2006 |  |  |  |
Number of Shares |  |  |  |
Nonvested at the beginning of the period (in shares) | 240,000 | 620,000 | 715,000 |
Exercised (in shares) | (240,000) | (290,000) | (80,000) |
Forfeited (in shares) |  |  | (15,000) |
Cancelled (in shares) |  | (90,000) |  |
Nonvested at the end of the period (in shares) | 0 | 240,000 | 620,000 | 715,000
Exercisable at end of period (in shares) | 0 |  |  |
Weighted- Average Exercise Price |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 26.73 | $ 26.73 | $ 26.73 |
Exercised (in dollars per share) | 26.73 | 26.73 | 26.73 |
Forfeited (in dollars per share) |  |  | 26.73 |
Cancelled (in dollars per share) |  | 26.73 |  |
Outstanding at the end of the period (in dollars per share) | 0.00 | $ 26.73 | $ 26.73 | $ 26.73
Exercisable (in dollars per share) | $ 0.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |
Weighted- Average Remaining Contractual Term (Years) | 0 years | 5 years 1 month 6 days | 3 years 6 months | 5 years 9 months 18 days
Aggregate Intrinsic Value | $ 0 | $ 7,920 | $ 20,600 | $ 33,000
Exercisable (in years) | 0 years |  |  |
Exercisable (in dollars) | $ 0 |  |  |

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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of stock appreciation rights outstanding and currently exercisable under the stock appreciation rights plan as of the balance sheet date. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock appreciation rights exercisable as of the balance-sheet date can be currently converted under the stock appreciation plan. + References No definition available. + Details
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- Definition The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock appreciation rights under the plan. + References No definition available. + Details
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- Definition Represents the maximum contractual term of share based compensation awards other than options which are scheduled to vest on December 31, 2011. + References No definition available. + Details
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- Definition Represents the maximum contractual term of share based compensation awards other than options which are scheduled to vest on December 31, 2016. + References No definition available. + Details
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- Definition The weighted-average period between the balance sheet date and expiration for all vested portions of stock appreciation rights outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years. + References No definition available. + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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