Summary of Significant Accounting Policies (Detail Textuals 2) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Accounting Policies [Abstract]
Unearned interest, dealer discounts and allowance for credit losses	$ 169,071,000	$ 155,001,000
Average dealer discount associated with new volume	8.08%	8.44%	8.54%
Sales of NDS to the Company's consolidated revenues	less than 1%
Cash paid for income taxes	7,304,000	10,837,000	11,273,000
Cash paid for interest, including debt origination costs	$ 6,124,000	$ 5,673,000	$ 5,043,000