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Related Party Transactions (Related Party Revenue) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Related party transactions: |  |  |
Management fees revenue | $ 29,075 | $ 26,533 | $ 25,341
Revenue from related parties | 33,955 | 32,619 | 36,173
Sac Holdings [Member] |  |  |
Related party transactions: |  |  |
Interest income revenue | 4,880 | 4,960 | 5,914
Management fees revenue | 19,635 | 18,657 | 18,472
Private Mini [Member] |  |  |
Related party transactions: |  |  |
Interest income revenue |  | 1,126 | 4,918
Management fees revenue | 3,495 | 3,330 | 2,614
Mercury [Member] |  |  |
Related party transactions: |  |  |
Management fees revenue | $ 5,945 | $ 4,546 | $ 4,255

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- Definition Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. + References No definition available. + Details
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