COMMITMENTS AND CONTINGENT LIABILITIES, CAPITAL EXPENDITURES (Details) (USD $)	12 Months Ended				12 Months Ended		2 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Solar Related Expenditures [Member]	Sep. 30, 2012 SAFE Related Expenditures [Member]	Nov. 28, 2012 Natural Disasters and Other Casualty Events [Member] MW
Long-term Purchase Commitment [Line Items]
Estimated Capital Expenditures Subsequent Fiscal Year	$ 119,300,000					$ 34,600,000
Estimated Capital Expenditures Two Years Subsequent To Fiscal Year	119,900,000					43,400,000
Capital Expenditures Paid and Committed					100,300,000
Damage as a Result of a Natural Disaster							1.5
Operating Leases, Future Minimum Payments Due, Current				2,100,000
Operating Leases, Future Minimum Payments, Due in Two Years				2,100,000
Operating Leases, Future Minimum Payments, Due in Three Years				2,100,000
Operating Leases, Future Minimum Payments, Due in Four Years				2,100,000
Operating Leases, Future Minimum Payments, Due in Five Years				2,100,000
Operating Leases, Future Minimum Payments, Due Thereafter				5,700,000
Payments to Acquire Other Productive Assets	$ 89,726,000	$ 71,989,000	$ 2,641,000