Pension and Other Post-Retirement Benefit Matters (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2012	Jul. 31, 2012	Jul. 31, 2012 United States Pension Plans of US Entity, Defined Benefit [Member]	Jul. 31, 2011 United States Pension Plans of US Entity, Defined Benefit [Member]	Jul. 31, 2012 United States Pension Plans of US Entity, Defined Benefit [Member]	Jul. 31, 2011 United States Pension Plans of US Entity, Defined Benefit [Member]	Jul. 31, 2012 United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]	Jul. 31, 2011 United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]	Jul. 31, 2012 United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]	Jul. 31, 2011 United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	$ 1,142	$ 4,766
Defined Benefit Plan, Service Cost			0	35	0	105
Change in Benefit Obligation Service Cost							0	2	0	5
Defined Benefit Plan, Interest Cost			921	955	2,762	2,866	11	8	33	23
Defined Benefit Plan, Expected Return on Plan Assets			(813)	(705)	(2,438)	(2,116)	0	0	0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses			260	311	780	933	14	15	41	45
Defined Benefit Plan, Net Periodic Benefit Cost			$ 368	$ 596	$ 1,104	$ 1,788	$ 25	$ 25	$ 74	$ 73