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Subsequent Event (Details)
$ in Millions
 6 Months Ended
Jul. 31, 2017
USD ($)
Subsequent Events [Abstract]  
Subsequent Event, Description On August 10, 2017, the Company, through a 95.35%owned subsidiary, purchased the entire ownership interest of a refined coal facility for approximately $12 million in cash. Thefacility is in operation and will begin affecting the Company’s financial results during the third quarter of fiscal year2017. The Company expects that the revenues from the sale of refined coal produced in the facility will be subsidized by federalproduction tax credits, subject to meeting qualified emissions reductions as governed by Section 45 of the Internal Revenue Code.The impact on the combined results of operationsof the Company and the refined coal facility, on a pro forma basis, as though the companies had been combined as of the beginningof fiscal year 2017 is insignificant as the refined coal facility has been inactive for several years up until the Company’sacquisition.The Company expects to complete its analysisof transaction costs related to the acquisition of the refined coal facility and the estimated fair value of assets acquired andliabilities assumed during the third quarter of fiscal year 2017.
Subsequent Event, Date Aug. 10, 2017
Equity Method Investment, Ownership Percentage 95.35%
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination $ 12