Pension and Other Post-Retirement Benefit Matters Components of Net Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Oct. 31, 2014	Oct. 31, 2013
United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Cost			$ 3,749	$ 3,260
Expected return on plan assets			(4,281)	(3,735)
Settlement			0	1,102
Amortization of net actuarial loss			1,074	1,392
Net periodic benefit cost			542	2,019
Define Benefit Plan, Number of Former Employees Electing Lump Sum Distributions				200
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Cost			38	34
Expected return on plan assets	0	0
Settlement			0	0
Amortization of net actuarial loss			41	48
Net periodic benefit cost			$ 79	$ 82