Condensed Consolidated Statements of Operations Parenthetical (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Depreciation:
Net gain on sale of real and personal property	$ (74,631)us-gaap_GainLossOnDispositionOfAssets1	$ (33,557)us-gaap_GainLossOnDispositionOfAssets1	$ (22,496)us-gaap_GainLossOnDispositionOfAssets1
Related party:
Related party revenues, net of eliminations	36,173	36,912	38,134
Related party, costs and expenses, net of eliminations	$ 54,709us-gaap_CostsAndExpensesRelatedParty	$ 52,552us-gaap_CostsAndExpensesRelatedParty	$ 46,461us-gaap_CostsAndExpensesRelatedParty

Costs of sales and operating expenses for the period incurred from transactions with related parties.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2443-110228

+ Details

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- Details

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- Definition

Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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