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Retirement Benefits - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Retirement Savings Plan [Member]
Sep. 30, 2014
SERP [Member]
Irrevocable Trust [Member]
Jun. 30, 2014
SERP [Member]
Irrevocable Trust [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Maximum employees contribution rate, pretax     50.00%    
Safe harbor non-elective contribution rate     3.00%    
Matching contribution by employer     50.00%    
Matching contribution rate     6.00%    
Matching and profit contribution vesting rate     25.00%    
Retirement benefits total plan assets       $ 97.5 $ 97.4
Retirement benefits Cash and cash equivalents       58.1 58.1
Surrender value of life insurance policies       39.4 39.3
Contributions to defined benefit pension plans 2.6 2.2      
Contribution amounts expected to be paid for the remainder of the fiscal year 2015 $ 7.5