Revenue Recognition (Table Text Block)	12 Months Ended
	Mar. 31, 2021
Revenue From Contract With Customer [Abstract]
Lease schedule over next five years and thereafter	Year Ended March 31,     2022   2023   2024   2025   2026   Thereafter           (In thousands)                           Self-moving equipment rentals $ 4,740 $ - $ - $ - $ - $ - Property lease revenues   19,099   13,079   9,612   7,210   5,648   55,060 Total $ 23,839 $ 13,079 $ 9,612 $ 7,210 $ 5,648 $ 55,060
Disaggregation of revenue	Years Ended March 31,     2021   2020   2019           (In thousands)               Revenues recognized over time $ 182,278 $ 147,565 $ 2,814,732 Revenues recognized at a point in time   396,600   309,804   305,408 Total revenues recognized under ASC 606   578,878   457,369   3,120,140               Revenues recognized under ASC 842 or 840   3,644,798   3,182,902   406,070 Revenues recognized under ASC 944   195,371   200,768   131,563 Revenues recognized under ASC 320   122,938   137,829   110,934 Total revenues $ 4,541,985 $ 3,978,868 $ 3,768,707