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Investments (Details) - USD ($) $ in Thousands		9 Months Ended
	Jun. 01, 2015	Oct. 31, 2015	Oct. 31, 2014	Jan. 31, 2015
Investments (Details) [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions		$ (7,643)	$ (19,881)
Gain (Loss) on Sale of Investments		(10,385)
Other Assets, Noncurrent		8,131		$ 6,366
Net Cash Provided by (Used in) Investing Activities		37,807	(6,738)
Related to Estimated Escrow Proceeds [Member]
Investments (Details) [Line Items]
Accounts Receivable, Net		2,200
Other Assets, Noncurrent		2,200
Big River [Member]
Investments (Details) [Line Items]
Retained Earnings, Undistributed Earnings from Equity Method Investees		21,100
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries		$ 337,300		322,100
Equity Method Investment, Ownership Percentage		9.70%
Patriot And Big River [Member]
Investments (Details) [Line Items]
Retained Earnings, Undistributed Earnings from Equity Method Investees				$ 41,900
Proceeds from Equity Method Investment, Dividends or Distributions		$ 7,600	$ 19,900
Patriot [Member]
Investments (Details) [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Cash Received at Closing, Merger Consideration	$ 45,500
Equity Method Investment, Ownership Percentage	27.00%
Total Merger Consideration	$ 196,000
Gain (Loss) on Sale of Investments	$ 10,400
Net Cash Provided by (Used in) Investing Activities		$ 45,500
Non Cash Provided by (Used in) Investing Activities		$ 4,400

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