Revenue Recognition (Table Text Block)	3 Months Ended	6 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Revenue From Contract With Customer [Abstract]
Disaggregation Of Revenue		Year Ended March 31,     2021   2022   2023   2024   2025   Thereafter     (Unaudited)     (In thousands)                           Self-moving equipment rentals $ 4,477 $ - $ - $ - $ - $ - Property lease revenues   19,871   13,565   10,465   7,497   5,835   57,082 Total $ 24,348 $ 13,565 $ 10,465 $ 7,497 $ 5,835 $ 57,082
Next five years and thereafter revenue	Quarter Ended September 30,     2020   2019     (Unaudited)     (In thousands)           Revenues recognized over time: $ 69,346 $ 48,986 Revenues recognized at a point in time:   114,854   86,265 Total revenues recognized under ASC 606   184,200   135,251           Revenues recognized under ASC 842 or 840   1,060,950   929,790 Revenues recognized under ASC 944   46,425   52,075 Revenues recognized under ASC 320   33,333   33,098 Total revenues $ 1,324,908 $ 1,150,214	Six Months Ended September 30,     2020   2019     (Unaudited)     (In thousands)           Revenues recognized over time: $ 114,284 $ 88,065 Revenues recognized at a point in time:   219,702   177,436 Total revenues recognized under ASC 606   333,986   265,501           Revenues recognized under ASC 842 or 840   1,835,644   1,794,994 Revenues recognized under ASC 944   92,200   100,121 Revenues recognized under ASC 320   50,315   68,847 Total revenues $ 2,312,145 $ 2,229,463