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Pension Benefits (Net Periodic Benefit Costs Assumptions) (Details) (Pension Benefits [Member])	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Pension Benefits [Member]
Discount rate	5.21%	6.34%	6.65%
Expected long-term return on plan assets	7.00%	8.00%	8.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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