Debt and Borrowings (Narrative) (Details)			12 Months Ended
	May 02, 2016 USD ($)	Dec. 12, 2014 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2016 GBP (£)	Jun. 30, 2016 EUR (€)
Line of Credit Facility [Line Items]
Line of credit potential incremental borrowing capacity post-amendment		$ 350,000,000
Revolving credit facility expiration date		Dec. 12, 2019
Interest coverage ratio		4.0
Leverage ratio		3.5
Consolidated leverage ratio		4.0
Aggregate principal amount of senior notes	$ 150,000,000
Senior notes term, in years	10 years
Senior notes maturity date	May 02, 2016
Senior notes interest percentage	5.98%
Senior notes outstanding			$ 0	$ 150,000,000
Interest paid			24,288,000	$ 22,865,000	$ 20,560,000
Credit Agreement borrowings payable to banks
Line of Credit Facility [Line Items]
Revolving credit facility		$ 1,000,000,000
Borrowing under letters of credit			827,860,000
Remaining borrowing capacity			$ 168,272,000
Long-term debt, weighted average interest rate			1.81%			1.81%	1.81%
Letter of credit
Line of Credit Facility [Line Items]
Borrowing under letters of credit			$ 3,868,000
Tilda short-term borrowing arrangements
Line of Credit Facility [Line Items]
Revolving credit facility | £						£ 52,000,000
Debt instrument, term			6 months
Short-term debt, weighted average interest rate			2.50%			2.50%	2.50%
Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility | €							€ 12,500,000
Mona
Line of Credit Facility [Line Items]
Short-term debt, weighted average interest rate			1.10%			1.10%	1.10%
Minimum | Credit Agreement borrowings payable to banks
Line of Credit Facility [Line Items]
Unused capacity, commitment fee, percentage		0.20%
Minimum | Eurocurrency Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		0.875%
Minimum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		0.00%
Maximum | Credit Agreement borrowings payable to banks
Line of Credit Facility [Line Items]
Unused capacity, commitment fee, percentage		0.30%
Maximum | Eurocurrency Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		1.70%
Maximum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		0.70%