Restatement of Previously Issued Condensed Consolidated Financial Statements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase (decrease) in inventory	$ 964,134	$ 941,918	$ 964,134	$ 941,918	$ 740,943
Increase (decrease) in accounts receivable	257,488	232,023	257,488	232,023	193,370
Increase (decrease) in retained earnings	(255,835)	(213,890)	(255,835)	(213,890)	(208,184)
Increase (decrease) in net income	(21,701)	$ (8,151)	(47,651)	$ (31,836)
Adjustments For Accounting Errors [Member] \| Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase (decrease) in inventory	(46,000)		(46,000)
Increase (decrease) in accounts receivable	(3,000)		(3,000)
Increase (decrease) in retained earnings	(49,000)		(49,000)		$ (39,000)
Increase (decrease) in net income	$ (4,000)		$ (10,000)

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3-4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Subparagraph a(1)
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 4
-Article 5

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Amount before valuation reserves of merchandise or goods held by the entity that are readily available for sale and items held by the entity which are partially complete or in the process of being readied for sale.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent, and includes adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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