STOCKHOLDERS' EQUITY (Details)									12 Months Ended
	Aug. 01, 2019 $ / shares shares	May 30, 2019 $ / shares shares	Jun. 04, 2018 $ / shares shares	Apr. 05, 2018 shares	Mar. 12, 2018 $ / shares shares	Nov. 03, 2017 shares	Oct. 25, 2017 $ / shares shares	Aug. 19, 2015 class_of_stock	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares	Jul. 31, 2018 USD ($)	Mar. 31, 2017 shares	Aug. 18, 2015 vote
Class of Stock [Line Items]
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares									$ 44.13	$ 46.71	$ 35.17
Number of classes of common stock | class_of_stock								2
Conversion ratio of common stock														1
Dividends outstanding | $									$ 8,780,000	$ 8,006,000
Stock repurchase program, authorized amount | $												$ 100,000,000
Class A
Class of Stock [Line Items]
Shares issued of common stock (in shares)									46,178,633	38,200,802
Stock Repurchased and Retired During Period, Shares									671,187	1,481,114	430,237
Shares issued to non-employee directors (in shares)					2,000,000,000	125,000	1,750,000
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares			$ 49.11
Common stock voting rights, number of votes per share | vote														1
Shares converted from Class B to Class A (in shares)										6,070,941
Number of common shares outstanding (in shares)									46,178,633	38,200,802
Stock repurchased and retired during period, value | $									$ 29,621,000	$ 69,180,000	$ 15,131,000
Class B
Class of Stock [Line Items]
Shares issued of common stock (in shares)									19,345,277	27,197,734
Stock Repurchased and Retired During Period, Shares									654,994	36,958	811,635
Common stock voting rights, number of votes per share | vote														10
Number of common shares outstanding (in shares)									19,345,277	27,197,734
Stock repurchased and retired during period, value | $									$ 31,451,000	$ 1,700,000	$ 33,332,000
ORIX USA Corporation
Class of Stock [Line Items]
Shares issued of common stock (in shares)										4,109,721
ORIX USA Corporation | Class A
Class of Stock [Line Items]
Shares issued to non-employee directors (in shares)	3,377,935	3,000,000
Selling price per share (in dollars per share) | $ / shares	$ 45.62	$ 45.80
Stock repurchased during period (in shares)			697,000
ORIX USA Corporation | Class B
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares				2,000,000,000
Number of common shares outstanding (in shares)										2,268,214
Director | Class A
Class of Stock [Line Items]
Shares issued to non-employee directors (in shares)									9,145	6,570
Investor | Class A
Class of Stock [Line Items]
Shares issued of common stock (in shares)									46,141,909	34,036,141
HL Holders | Class B
Class of Stock [Line Items]
Number of common shares outstanding (in shares)									19,345,277	24,929,520
Follow-on Offering | Class A
Class of Stock [Line Items]
Shares issued of common stock (in shares)					2,000,000
Sale of stock, price per share (in dollars per share) | $ / shares					$ 47.25		$ 42.00
Selling price per share (in dollars per share) | $ / shares			$ 49.15
Follow-on Offering | ORIX USA Corporation | Class A
Class of Stock [Line Items]
Shares issued to non-employee directors (in shares)			1,985,983
Common Stock | Class A
Class of Stock [Line Items]
Shares issued to non-employee directors (in shares)									9,145	6,570	5,589
Shares converted from Class B to Class A (in shares)									8,639,873
Number of common shares outstanding (in shares)									46,178,633	38,200,802	30,604,405		22,026,811
Common Stock | Class B
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares										2,000,000	6,900,000
Number of common shares outstanding (in shares)									19,345,277	27,197,734	37,187,932		50,883,299
Stock repurchased and retired during period, value | $										$ 2,000	$ 7,000
Affiliated Entity | Follow-on Offering | Class A
Class of Stock [Line Items]
Shares issued to non-employee directors (in shares)			1,014,017
Director
Class of Stock [Line Items]
Shares issued of common stock (in shares)									36,724	54,940
Forward Purchase Agreement | Forward Contracts
Class of Stock [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount										2,000,000,000