The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Transactions with Affiliates (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
Transactions with Affiliates (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Transactions with Affiliates
Receivables from affiliates	$ 41,706,000us-gaap_DueFromRelatedPartiesCurrent		$ 41,706,000us-gaap_DueFromRelatedPartiesCurrent		$ 7,445,000us-gaap_DueFromRelatedPartiesCurrent	$ 22,883,000us-gaap_DueFromRelatedPartiesCurrent
Payables to related parties	85,307,000us-gaap_DueToRelatedPartiesCurrent		85,307,000us-gaap_DueToRelatedPartiesCurrent		76,846,000us-gaap_DueToRelatedPartiesCurrent	6,900,000us-gaap_DueToRelatedPartiesCurrent
SemGroup
Transactions with Affiliates
Sales to related party	43,427,000	3,780,000	117,233,000	3,780,000	306,780,000	32,431,000	29,200,000
Purchase from related parties	45,730,000	28,377,000	118,997,000	47,916,000	445,951,000	60,425,000	23,800,000
Receivables from affiliates	39,331,000		39,331,000		7,303,000
Payables to related parties	44,015,000		44,015,000		27,738,000	4,601,000
Equity method investee
Transactions with Affiliates
Sales to related party	9,131,000		9,131,000
Purchase from related parties	34,689,000		70,965,000
Receivables from affiliates	670,000		670,000
Payables to related parties	39,549,000		39,549,000		48,454,000
Entities affiliated with management
Transactions with Affiliates
Increase in property, plant and equipment			5,800,000		8,200,000
Sales to related party	1,706,000	58,769,000	1,854,000	109,872,000	110,824,000	16,828,000
Purchase from related parties	3,845,000	48,522,000	6,984,000	56,346,000	120,038,000	60,942,000
Receivables from affiliates	1,705,000		1,705,000		142,000	22,883,000
Payables to related parties	$ 1,743,000		$ 1,743,000		$ 654,000	$ 2,299,000