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Schedule I - Condensed Financial Information of AMERCO (Statements of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Revenues: |  |  |
Net interest income from subs | $ 3,421,767 | $ 3,275,468 | $ 3,074,531
Expenses: |  |  |
Operating expenses | 1,568,083 | 1,470,047 | 1,479,409
Total costs and expenses | 2,679,504 | 2,408,842 | 2,411,507
Equity in earnings of subsidiaries |  |  |
Pretax earnings | 628,358 | 768,911 | 561,418
Income tax expense | (229,934) | (279,910) | (204,677)
Earnings available to common shareholders | $ 398,424 | $ 489,001 | $ 356,741
Basic and diluted earnings per common share | $ 20.34 | $ 24.95 | $ 18.21
Weighted average common shares outstanding: basic and diluted | 19,586,606 | 19,596,110 | 19,586,633
Amerco [Member] |  |  |
Revenues: |  |  |
Net interest income from subs | $ 1,912 | $ 2,420 | $ 4,862
Expenses: |  |  |
Operating expenses | 7,115 | 7,525 | 7,055
Other expenses | 109 | 111 | 99
Total costs and expenses | 7,224 | 7,636 | 7,154
Equity in earnings of subsidiaries | 327,773 | 417,087 | 300,566
Interest income | 103,211 | 93,873 | 75,241
Pretax earnings | 425,672 | 505,744 | 373,515
Income tax expense | (27,248) | (16,743) | (16,774)
Earnings available to common shareholders | $ 398,424 | $ 489,001 | $ 356,741
Basic and diluted earnings per common share | $ 20.34 | $ 24.95 | $ 18.21
Weighted average common shares outstanding: basic and diluted | 19,586,606 | 19,596,110 | 19,586,633

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