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Consolidating financial information by industry segment (Statement of Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Revenues: |  |  |  |  |  |  |
Self-moving equipment rentals |  | $ 2,362,833 |  | $ 2,297,980 |  | $ 2,146,391 |
Self-storage revenues |  | 286,886 |  | 247,944 |  | 211,136 |
Self-moving and self-storage products and service sales |  | 253,073 |  | 251,541 |  | 244,177 |
Property management fees |  | 29,075 |  | 26,533 |  | 25,341 |
Life insurance premiums |  | 163,579 |  | 162,662 |  | 156,103 |
Property and casualty insurance premiums |  | 52,334 |  | 50,020 |  | 46,456 |
Net investment and interest income |  | 102,276 |  | 86,617 |  | 84,728 |
Other revenue |  | 171,711 |  | 152,171 |  | 160,199 |
Total revenues |  | 3,421,767 |  | 3,275,468 |  | 3,074,531 |
Costs and expenses: |  |  |  |  |  |  |
Operating expenses |  | 1,568,083 |  | 1,470,047 |  | 1,479,409 |
Commission expenses |  | 267,230 |  | 262,627 |  | 249,642 |
Cost of sales |  | 152,485 |  | 144,990 |  | 146,072 |
Benefits and losses |  | 182,710 |  | 167,436 |  | 158,760 |
Amortization of deferred policy acquisition costs |  | 26,218 |  | 23,272 |  | 19,661 |
Lease expense |  | 37,343 |  | 49,780 |  | 79,798 |
Depreciation, net of (gains) losses on disposals |  | 445,435 |  | 290,690 |  | 278,165 |
Total costs and expenses |  | 2,679,504 |  | 2,408,842 |  | 2,411,507 |
Earnings from operations before equity in earnings of subsidiaries |  | 742,263 |  | 866,626 |  | 663,024 |
Equity in earnings of subsidiaries |  |  |  |  |  |  |
Earnings from operations |  | 742,263 |  | 866,626 |  | 663,024 |
Interest expense |  | (113,406) |  | (97,715) |  | (97,525) |
Fees and amortization on early extinguishment of debt |  | (499) |  |  |  | (4,081) |
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 |
Operating Segments [Member] | Moving and Storage Consolidations [Member] |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |
Self-moving equipment rentals |  | 2,366,526 |  | 2,301,586 |  | 2,149,986 |
Self-storage revenues |  | 286,886 |  | 247,944 |  | 211,136 |
Self-moving and self-storage products and service sales |  | 253,073 |  | 251,541 |  | 244,177 |
Property management fees |  | 29,075 |  | 26,533 |  | 25,341 |
Life insurance premiums |  |  |  |  |  |  |
Property and casualty insurance premiums |  |  |  |  |  |  |
Net investment and interest income |  | 9,688 |  | 8,801 |  | 13,644 |
Other revenue |  | 167,752 |  | 148,099 |  | 156,154 |
Total revenues |  | 3,113,000 |  | 2,984,504 |  | 2,800,438 |
Costs and expenses: |  |  |  |  |  |  |
Operating expenses |  | 1,521,408 |  | 1,423,107 |  | 1,436,145 |
Commission expenses |  | 267,230 |  | 262,627 |  | 249,642 |
Cost of sales |  | 152,485 |  | 144,990 |  | 146,072 |
Benefits and losses |  |  |  |  |  |  |
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |
Lease expense |  | 37,529 |  | 49,966 |  | 79,984 |
Depreciation, net of (gains) losses on disposals |  | 445,435 |  | 290,690 |  | 278,165 |
Total costs and expenses |  | 2,424,087 |  | 2,171,380 |  | 2,190,008 |
Earnings from operations before equity in earnings of subsidiaries |  | 688,913 |  | 813,124 |  | 610,430 |
Equity in earnings of subsidiaries |  | 35,797 |  | 35,522 |  | 34,783 |
Earnings from operations |  | 724,710 |  | 848,646 |  | 645,213 |
Interest expense |  | (114,863) |  | (98,533) |  | (98,163) |
Fees and amortization on early extinguishment of debt |  | (499) |  |  |  | (4,081) |
Pretax earnings |  | 609,348 |  | 750,113 |  | 542,969 |
Income tax expense |  | (210,924) |  | (261,112) |  | (186,228) |
Earnings available to common shareholders |  | 398,424 |  | 489,001 |  | 356,741 |
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |
Self-moving equipment rentals |  |  | [1] |  | [2] |  | [3]
Self-storage revenues |  |  | [1] |  | [2] |  | [3]
Self-moving and self-storage products and service sales |  |  | [1] |  | [2] |  | [3]
Property management fees |  |  | [1] |  | [2] |  | [3]
Life insurance premiums |  |  | [1] |  | [2] |  | [3]
Property and casualty insurance premiums |  | 52,334 | [1] | 50,020 | [2] | 46,456 | [3]
Net investment and interest income |  | 16,652 | [1] | 14,783 | [2] | 12,819 | [3]
Other revenue |  |  | [1] |  | [2] |  | [3]
Total revenues |  | 68,986 | [1] | 64,803 | [2] | 59,275 | [3]
Costs and expenses: |  |  |  |  |  |  |
Operating expenses |  | 28,421 | [1] | 27,958 | [2] | 24,802 | [3]
Commission expenses |  |  | [1] |  | [2] |  | [3]
Cost of sales |  |  | [1] |  | [2] |  | [3]
Benefits and losses |  | 13,404 | [1] | 12,298 | [2] | 10,996 | [3]
Amortization of deferred policy acquisition costs |  |  | [1] |  | [2] |  | [3]
Lease expense |  |  | [1] |  | [2] |  | [3]
Depreciation, net of (gains) losses on disposals |  |  | [1] |  | [2] |  | [3]
Total costs and expenses |  | 41,825 | [1] | 40,256 | [2] | 35,798 | [3]
Earnings from operations before equity in earnings of subsidiaries |  | 27,161 | [1] | 24,547 | [2] | 23,477 | [3]
Equity in earnings of subsidiaries |  |  | [1] |  | [2] |  | [3]
Earnings from operations |  | 27,161 | [1] | 24,547 | [2] | 23,477 | [3]
Interest expense |  |  | [1] |  | [2] |  | [3]
Fees and amortization on early extinguishment of debt |  |  |  |  |  |  |
Pretax earnings |  | 27,161 | [1] | 24,547 | [2] | 23,477 | [3]
Income tax expense |  | (9,346) | [1] | (8,379) | [2] | (8,060) | [3]
Earnings available to common shareholders |  | 17,815 | [1] | 16,168 | [2] | 15,417 | [3]
Operating Segments [Member] | Life Insurance [Member] |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |
Self-moving equipment rentals |  |  | [1] |  | [2] |  | [3]
Self-storage revenues |  |  | [1] |  | [2] |  | [3]
Self-moving and self-storage products and service sales |  |  | [1] |  | [2] |  | [3]
Property management fees |  |  | [1] |  | [2] |  | [3]
Life insurance premiums |  | 163,579 | [1] | 162,662 | [2] | 156,103 | [3]
Property and casualty insurance premiums |  |  | [1] |  | [2] |  | [3]
Net investment and interest income |  | 77,540 | [1] | 63,999 | [2] | 59,051 | [3]
Other revenue |  | 4,480 | [1] | 4,559 | [2] | 4,502 | [3]
Total revenues |  | 245,599 | [1] | 231,220 | [2] | 219,656 | [3]
Costs and expenses: |  |  |  |  |  |  |
Operating expenses |  | 22,429 | [1] | 23,037 | [2] | 22,476 | [3]
Commission expenses |  |  | [1] |  | [2] |  | [3]
Cost of sales |  |  | [1] |  | [2] |  | [3]
Benefits and losses |  | 169,306 | [1] | 155,138 | [2] | 147,764 | [3]
Amortization of deferred policy acquisition costs |  | 26,218 | [1] | 23,272 | [2] | 19,661 | [3]
Lease expense |  |  | [1] |  | [2] |  | [3]
Depreciation, net of (gains) losses on disposals |  |  | [1] |  | [2] |  | [3]
Total costs and expenses |  | 217,953 | [1] | 201,447 | [2] | 189,901 | [3]
Earnings from operations before equity in earnings of subsidiaries |  | 27,646 | [1] | 29,773 | [2] | 29,755 | [3]
Equity in earnings of subsidiaries |  |  | [1] |  | [2] |  | [3]
Earnings from operations |  | 27,646 | [1] | 29,773 | [2] | 29,755 | [3]
Interest expense |  |  | [1] |  | [2] |  | [3]
Fees and amortization on early extinguishment of debt |  |  |  |  |  |  |
Pretax earnings |  | 27,646 | [1] | 29,773 | [2] | 29,755 | [3]
Income tax expense |  | (9,664) | [1] | (10,419) | [2] | (10,389) | [3]
Earnings available to common shareholders |  | 17,982 | [1] | 19,354 | [2] | 19,366 | [3]
Eliminations [Member] |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |
Self-moving equipment rentals | [4] | (3,693) |  | (3,606) |  | (3,595) |
Self-storage revenues |  |  |  |  |  |  |
Self-moving and self-storage products and service sales |  |  |  |  |  |  |
Property management fees |  |  |  |  |  |  |
Life insurance premiums |  |  |  |  |  |  |
Property and casualty insurance premiums |  |  |  |  |  |  |
Net investment and interest income | [5] | (1,604) |  | (966) |  | (786) |
Other revenue | [5] | (521) |  | (487) |  | (457) |
Total revenues |  | (5,818) |  | (5,059) |  | (4,838) |
Costs and expenses: |  |  |  |  |  |  |
Operating expenses | [4],[5] | (4,175) |  | (4,055) |  | (4,014) |
Commission expenses |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |
Benefits and losses |  |  |  |  |  |  |
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |
Lease expense | [5] | (186) |  | (186) |  | (186) |
Depreciation, net of (gains) losses on disposals |  |  |  |  |  |  |
Total costs and expenses |  | (4,361) |  | (4,241) |  | (4,200) |
Earnings from operations before equity in earnings of subsidiaries |  | (1,457) |  | (818) |  | (638) |
Equity in earnings of subsidiaries | [6] | (35,797) |  | (35,522) |  | (34,783) |
Earnings from operations |  | (37,254) |  | (36,340) |  | (35,421) |
Interest expense | [5] | 1,457 |  | 818 |  | 638 |
Fees and amortization on early extinguishment of debt |  |  |  |  |  |  |
Pretax earnings |  | (35,797) |  | (35,522) |  | (34,783) |
Income tax expense |  |  |  |  |  |  |
Earnings available to common shareholders |  | $ (35,797) |  | $ (35,522) |  | $ (34,783) |
[1] | Balances for the year ended December 31, 2016
[2] | Balances for the year ended December 31, 2015
[3] | Balances for the year ended December 31, 2014
[4] | Eliminate intercompany premiums
[5] | Eliminate intercompany lease / interest income
[6] | Eliminate equity in earnings of subsidiaries

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