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Schedule I - Condensed Financial Information of AMERCO (Statements of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Revenues: |  |  |
Net interest income from subs | $ 3,768,707 | $ 3,601,114 | $ 3,421,767
Expenses: |  |  |
Operating expenses | 1,981,180 | 1,807,056 | 1,567,181
Total costs and expenses | 3,147,720 | 2,835,868 | 2,678,602
Equity in earnings of subsidiaries |  |  |
Pretax earnings | 477,529 | 637,613 | 628,358
Income tax expense | (106,672) | 152,970 | (229,934)
Earnings available to common shareholders | $ 370,857 | $ 790,583 | $ 398,424
Basic and diluted earnings per common share | $ 18.93 | $ 40.36 | $ 20.34
Weighted average common shares outstanding: basic and diluted | 19,592,048 | 19,588,889 | 19,586,606
Amerco [Member] |  |  |
Revenues: |  |  |
Net interest income from subs | $ 8,601 | $ 4,606 | $ 1,912
Expenses: |  |  |
Operating expenses | 8,840 | 7,003 | 7,115
Other expenses | 93 | 91 | 109
Total costs and expenses | 8,933 | 7,094 | 7,224
Equity in earnings of subsidiaries | 279,589 | 681,786 | 327,773
Interest income | 112,649 | 120,549 | 103,211
Pretax earnings | 391,906 | 799,847 | 425,672
Income tax expense | (21,049) | (9,264) | (27,248)
Earnings available to common shareholders | $ 370,857 | $ 790,583 | $ 398,424
Basic and diluted earnings per common share | $ 18.93 | $ 40.36 | $ 20.34
Weighted average common shares outstanding: basic and diluted | 19,592,048 | 19,588,889 | 19,586,606

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