Guarantees (Details) - USD ($)	9 Months Ended
	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Guarantor Obligations [Line Items]
Amounts guaranteed (not to exceed)	$ 184,096,000	$ 210,703,000	$ 256,300,000
Amounts outstanding under guarantee	86,218,000	107,615,000	131,706,000
Fair value of guarantees	$ 4,759,000	7,350,000	5,852,000
Number of years, before expiring guarantees	1 year
Financial Guarantee
Guarantor Obligations [Line Items]
Amounts outstanding under guarantee	$ 0	$ 16,699,000	$ 0