Equity and Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 10, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Feb. 29, 2016	Dec. 31, 2015	Oct. 26, 2016	Jun. 30, 2016	Sep. 14, 2015
Class of Stock [Line Items]
Unrealized Gain (Loss) on Derivatives and Commodity Contracts		$ 20,300
Preferred Stock, Shares Authorized		5,000,000		5,000,000				5,000,000
Preferred Stock, Par or Stated Value Per Share		$ 0.01		$ 0.01				$ 0.01
Preferred Stock, Shares Outstanding		0		0				0
Common Stock, Shares Authorized		150,000,000		150,000,000				150,000,000
Common Stock, Par or Stated Value Per Share		$ 0.01		$ 0.01				$ 0.01
Common Stock, Shares, Outstanding		50,900,000		50,900,000				52,900,000
Disclosure of Repurchase Agreements [Abstract]
PercentOfSharesReceivedUnderASR				80.00%		80.00%
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income attributable to common stock		$ 21,800	$ 39,400	$ 59,600		$ 64,300
Weighted average number of shares outstanding, used in computing basic earnings per share		52,000,000	53,300,000	52,400,000		54,100,000
Dilutive common stock equivalents		700,000	700,000	800,000		800,000
Weighted average number of shares outstanding used in computing diluted earnings per share		52,700,000	54,000,000	53,200,000		54,900,000
Basic earnings per share		$ 0.42	$ 0.74	$ 1.14		$ 1.19
Diluted earnings per share		$ 0.41	$ 0.73	$ 1.12		$ 1.17
Anti-dilutive options (excluded from the calculation of diluted earnings per share)		600,000	1,400,000	800,000		1,200,000
FY2017StockRepurchasePlan [Member] [Domain] [Domain]
Disclosure of Repurchase Agreements [Abstract]
Stock Repurchase Program Authorized Amount							$ 200,000
Treasury Stock, Shares, Acquired						2,800,000
Treasury Stock, Value, Acquired, Cost Method		$ 200,000
Accelerated Share Repurchases, Initial Price Paid Per Share				$ 57.51
FY2016StockRepurchasePlan [Member] [Member] [Domain]
Disclosure of Repurchase Agreements [Abstract]
Stock Repurchase Program Authorized Amount									$ 200,000
Treasury Stock, Shares, Acquired	900,000				3,200,000	2,300,000
Accelerated Share Repurchases, Final Price Paid Per Share		$ 62.92
Accelerated Share Repurchases, Initial Price Paid Per Share						$ 70.35