Retirement Benefits (Narrative) (Detail) (Retirement Savings Plan [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Retirement Savings Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Maximum employee contribution rate, pretax	50.00%
Safe harbor non-elective contribution rate	3.00%
Matching contribution rate	3.00%
Matching and profit contribution vesting rate	25.00%
Contributions to defined benefit pension plans	$ 2.4	$ 2.1
Estimated expense relating to retirement savings plan for the year 2013	$ 6.7

This represents the entire liability recognized in the balance sheet that is associated with other postretirement defined benefit plans (excluding pension plans).

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+ Details