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Retirement Benefits - Additional Information (Detail)
12 Months Ended
Jun. 30, 2016
USD ($)
Contract
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Retirement benefits total plan assets $ 3,286,000 $ 3,764,000 $ 6,641,000
Contribution amounts expected to be paid 2017 10,400,000    
Contribution amounts expected to be paid 2018 10,300,000    
Contribution amounts expected to be paid 2019 9,800,000    
Contribution amounts expected to be paid 2020 10,300,000    
Contribution amounts expected to be paid 2021 11,200,000    
Contribution amounts expected to be paid 2022 to 2026 $ 66,600,000    
Percent of assets invested in unitized fund 100.00%    
Plan Assets Exceed Obligations [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets exceed obligations $ 0 0  
Retirement Savings Plan [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%    
Expenses related to the retirement Savings Plan $ 14,600,000 12,000,000 $ 9,300,000
SERP [Member] | Irrevocable Trust [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Retirement benefits total plan assets 92,700,000 98,400,000  
Surrender value of life insurance policies 40,800,000 40,000,000  
SERP [Member] | Irrevocable Trust [Member] | Equity and Fixed Income Mutual Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Available-for-sale securities 51,800,000 52,300,000  
SERP [Member] | Cash and Cash Equivalents | Irrevocable Trust [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Retirement benefits cash and cash equivalents 100,000 $ 6,100,000  
Foreign Plan One [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Retirement benefits total plan assets 3,100,000    
Foreign Plan Two [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Retirement benefits total plan assets $ 200,000    
Number of insurance contracts | Contract 2