Long-Term Debt Foreign Seasonal Lines of Credit (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2016 USD ($)
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 426,611
Unused lines of credit	439,668
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	475,989
Line of credit facility, current borrowing capacity	910,131
Unused lines of credit	13,057
Line of credit facility, amount issued but unfunded	$ 4,733
Minimum [Member] | Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, borrowing period	180 days
Maximum [Member] | Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, borrowing period	270 days