Income Taxes (Accounting for Uncertainty in Income Taxes) (Details) (USD $)	12 Months Ended			3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2013 Michigan
Reconciliation of unrecognized tax benefits [Roll Forward]
Balance, beginning	$ 9,700,000	$ 13,200,000	$ 11,900,000
Additions based on tax positions related to the current year	0	6,100,000	900,000
Additions for tax positions of prior years	900,000	3,500,000	700,000
Reductions for tax positions of prior years	(10,300,000)	(13,100,000)	(300,000)
Settlements	0	0	0
Balance, ending	300,000	9,700,000	13,200,000
Income Tax Uncertainties [Abstract]
Interest and penalties related to unrecognized tax benefits	2,000	5,000
Deferred tax benefit	$ (25,800,000)	$ (20,900,000)	$ 2,600,000	$ 4,900,000