Acquisitions (Details 10) (USD $)		12 Months Ended										12 Months Ended			12 Months Ended			12 Months Ended								12 Months Ended				12 Months Ended					12 Months Ended								12 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Vehicles Minimum	Mar. 31, 2012 Vehicles Minimum	Mar. 31, 2013 Vehicles Maximum	Mar. 31, 2012 Vehicles Maximum	Mar. 31, 2012 Buildings Minimum	Mar. 31, 2013 North American	Mar. 31, 2012 North American	Feb. 03, 2012 North American	Mar. 31, 2012 North American Estimated Allocation	Mar. 31, 2013 North American Revision	Mar. 31, 2013 North American Customer relationships	Mar. 31, 2012 North American Customer relationships Estimated Allocation	Mar. 31, 2013 North American Customer relationships Revision	Mar. 31, 2013 North American Trade names	Mar. 31, 2012 North American Trade names Estimated Allocation	Mar. 31, 2013 North American Trade names Revision	Mar. 31, 2013 North American Non-compete agreements	Mar. 31, 2013 North American Non-compete agreements Revision	Mar. 31, 2013 North American Land	Mar. 31, 2012 North American Land Estimated Allocation	Mar. 31, 2013 North American Land Revision	Mar. 31, 2013 North American Tanks and other retail propane equipment	Mar. 31, 2012 North American Tanks and other retail propane equipment Estimated Allocation	Mar. 31, 2013 North American Tanks and other retail propane equipment Revision	Mar. 31, 2013 North American Tanks and other retail propane equipment Minimum	Mar. 31, 2013 North American Tanks and other retail propane equipment Maximum	Mar. 31, 2013 North American Terminal assets	Mar. 31, 2013 North American Terminal assets Revision	Mar. 31, 2013 North American Terminal assets Minimum	Mar. 31, 2013 North American Terminal assets Maximum	Mar. 31, 2013 North American Vehicles	Mar. 31, 2012 North American Vehicles Estimated Allocation	Mar. 31, 2013 North American Vehicles Revision	Mar. 31, 2013 North American Vehicles Minimum	Mar. 31, 2013 North American Vehicles Maximum	Mar. 31, 2013 North American Buildings	Mar. 31, 2012 North American Buildings Estimated Allocation	Mar. 31, 2013 North American Buildings Revision	Mar. 31, 2013 North American Other equipment	Mar. 31, 2012 North American Other equipment Estimated Allocation	Mar. 31, 2013 North American Other equipment Revision	Mar. 31, 2013 North American Other equipment Minimum	Mar. 31, 2013 North American Other equipment Maximum
Acquisitions
Cash paid to acquire ownership interests	$ 14,000,000								$ 69,800,000
General and administrative expense								1,600,000
Estimated fair value of the assets acquired and liabilities assumed
Accounts receivable							10,338,000			10,338,000
Inventory							3,437,000			3,437,000
Other current assets							282,000			282,000
Property, plant and equipment																				2,251,000	2,600,000	(349,000)	24,790,000	27,100,000	(2,310,000)			1,044,000	1,044,000			5,819,000	9,000,000	(3,181,000)			2,386,000	2,200,000	186,000	634,000	500,000	134,000
Useful life of property, plant and equipment		5 years	5 years	10 years	10 years	5 years																				15 years	20 years			15 years	20 years				5 years	15 years	30 years						3 years	5 years
Intangible assets												12,600,000	9,800,000	2,800,000	2,700,000	1,000,000	1,700,000	700,000	700,000
Useful life of intangible assets												10 years			10 years			3 years
Goodwill							13,978,000			14,702,000	(724,000)
Assumed liabilities							(11,129,000)			(11,129,000)
Consideration paid, net of cash acquired							$ 69,830,000			$ 69,830,000