Revenue Recognition (Table Text Block)	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Mar. 31, 2021
Revenue From Contract With Customer [Abstract]
Disaggregation Of Revenue			Year Ended March 31,     2022   2023   2024   2025   2026   Thereafter     (Unaudited)     (In thousands)                           Self-moving equipment rentals $ 6,186 $ – $ – $ – $ – $ – Property lease revenues   16,213   12,287   8,560   6,161   4,581   48,866 Total$ 22,399 $ 12,287 $ 8,560 $ 6,161 $ 4,581 $ 48,866
Next five years and thereafter revenue	Quarter Ended September 30,     2021   2020     (Unaudited)     (In thousands)           Revenues recognized over time: $   108,038 $   69,346 Revenues recognized at a point in time:   110,924   114,854 Total revenues recognized under ASC 606   218,962   184,200           Revenues recognized under ASC 842   1,355,934   1,060,950 Revenues recognized under ASC 944   52,578   46,425 Revenues recognized under ASC 320   36,780   33,333 Total revenues$  1,664,254 $  1,324,908	Six Months Ended September 30,     2021   2020     (Unaudited)     (In thousands)           Revenues recognized over time: $   187,853 $   114,284 Revenues recognized at a point in time:   231,642   219,702 Total revenues recognized under ASC 606   419,495   333,986           Revenues recognized under ASC 842   2,546,944   1,835,644 Revenues recognized under ASC 944   98,892   92,200 Revenues recognized under ASC 320   71,779   50,315 Total revenues$  3,137,110 $  2,312,145