Employee Postretirement Benefits (Assumptions used to calculate benefit obligation) (Details) - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
	Aug. 31, 2015	Jan. 31, 2015	Oct. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Measurement Date	Aug. 31, 2015	Jan. 31, 2015
Defined Benefit Plan, Effect of Plan Amendment on Net Periodic Benefit Cost			$ 300
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.25%	3.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	4.00%	4.00%
Defined Benefit other postretirement plan, avg years of service	15 years 1 month 21 days	16 years 18 days
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2030	2025
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	7.00%	7.20%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	4.50%	5.00%