Discontinued Operations (Details3) - USD ($) $ in Millions	May 31, 2017	May 31, 2016
Current Assets
Current assets of discontinued operations	$ 0.4	$ 0.5
Current Liabilities
Current liabilities of discontinued operations	0.5	1.2
Discontinued Operations [Member]
Current Assets
Accounts receivable, net	0.0	0.0
Prepaid expenses and other current assets	0.4	0.5
Current assets of discontinued operations	0.4	0.5
Current Liabilities
Accounts payable	0.0	0.0
Accrued royalties	0.5	0.0
Other accrued expenses	0.0	1.2
Current liabilities of discontinued operations	$ 0.5	$ 1.2