Quarterly Data (Unaudited) (Summarized Unaudited Quarterly Data) (Details) (USD $)	3 Months Ended								12 Months Ended
	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Revenues	$ 399,030,000	$ 722,117,000	$ 869,683,000	$ 415,030,000	$ 350,673,000	$ 603,020,000	$ 658,865,000	$ 362,909,000	$ 2,405,860,000	$ 1,975,467,000	$ 2,339,092,000
Gross margin from propane and other gas liquids sales (a)	126,685,000	202,861,000	237,940,000	123,469,000	123,343,000	195,201,000	206,838,000	121,624,000
Net earnings (loss)	(48,241,000)	45,890,000	61,123,000	(25,057,000)	(29,060,000)	45,180,000	58,843,000	(17,796,000)	33,715,000	57,167,000	(10,896,000)
Net earnings (loss) attributable to Ferrellgas Partners, L.P.	(47,795,000)	45,385,000	60,464,000	(24,843,000)	(28,804,000)	44,681,000	58,207,000	(17,658,000)	33,211,000	56,426,000	(10,952,000)
Common unitholders' interest in net earnings (loss)	(47,317,000)	44,931,000	59,860,000	(24,595,000)	(28,516,000)	44,234,000	55,069,000	(17,481,000)	32,879,000	55,862,000	(10,842,000)
Basic and diluted net earnings (loss) per common unitholders' interest	$ (0.58)	$ 0.57	$ 0.72	$ (0.31)	$ (0.36)	$ 0.56	$ 0.70	$ (0.22)	$ 0.41	$ 0.71	$ (0.14)
Ferrellgas, L.P. [Member]
Revenues	399,030,000	722,117,000	869,683,000	415,030,000	350,673,000	603,020,000	658,865,000	362,909,000	2,405,860,000	1,975,467,000	2,339,092,000
Gross margin from propane and other gas liquids sales (a)	126,685,000	202,861,000	237,940,000	123,469,000	123,343,000	195,201,000	206,838,000	121,624,000
Net earnings (loss)	$ (44,179,000)	$ 50,053,000	$ 65,171,000	$ (21,138,000)	$ (25,282,000)	$ 49,396,000	$ 62,953,000	$ (13,692,000)	$ 49,907,000	$ 73,375,000	$ 5,589,000