Partners' Capital, Mezzanine and Equity Distributions (New Common Units Issued To The Public For Cash) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Mar. 24, 2017	Jul. 27, 2016	Jul. 22, 2015	Apr. 10, 2015
Equity [Abstract]
Units (in shares)	4,600	8,000	10,350	4,600
Gross Unit Price (in dollars per share)	$ 30.65	$ 37.90	$ 43.77	$ 44.42
Issuance Value	$ 140,990	$ 303,200	$ 453,020	$ 204,332
Costs	(477)	(4,748)	(15,856)	(6,164)
Net Proceeds	$ 140,513	$ 298,452	$ 437,164	$ 198,168