CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014		Nov. 30, 2013
Income Statement [Abstract]
Revenues	$ 665.6	$ 623.2	$ 949.4		$ 899.5
Operating costs and expenses:
Cost of goods sold (exclusive of depreciation and amortization)	288.7	264.8	438.9		402.7
Selling, general and administrative expenses (exclusive of depreciation and amortization)	248.2	234.4	421.7		402.8
Depreciation and amortization	13.0	15.9	26.5		31.8
Asset impairments	2.9	13.4	2.9	[1]	13.4	[1]
Total operating costs and expenses	552.8	528.5	890.0		850.7
Operating income (loss)	112.8	94.7	59.4		48.8
Interest expense, net	(1.0)	(2.1)	(1.9)		(4.0)
Gain (Loss) on Investments	0.6	0	0.6		0
Earnings (loss) from continuing operations before income taxes	112.4	92.6	58.1		44.8
Provision (benefit) for income taxes	43.8	34.3	23.5		16.6
Earnings (loss) from continuing operations	68.6	58.3	34.6		28.2
Earnings (loss) from discontinued operations, net of tax	(0.1)	0	(0.2)		0.2
Net income (loss)	$ 68.5	$ 58.3	$ 34.4		$ 28.4
Basic:
Earnings (loss) from continuing operations (in Dollars per share)	$ 2.10	$ 1.82	$ 1.06		$ 0.88
Earnings (loss) from discontinued operations, net of tax (in Dollars per share)	$ (0.01)	$ 0.00	$ 0.000000		$ 0.01
Net income (loss) (in Dollars per share)	$ 2.09	$ 1.82	$ 1.06		$ 0.89
Diluted:
Earnings (loss) from continuing operations (in Dollars per share)	$ 2.06	$ 1.80	$ 1.04		$ 0.87
Earnings (loss) from discontinued operations, net of tax (in Dollars per share)	$ (0.01)	$ 0.00	$ 0.000000		$ 0.01
Net income (loss) (in Dollars per share)	$ 2.05	$ 1.80	$ 1.04		$ 0.88
Dividends declared per class A and common share (in Dollars per share)	$ 0.15	$ 0.15	$ 0.3		$ 0.275

[1] Includes an asset impairment related to the planned closure of a retail store in New York City in fiscal 2015 and an impairment of goodwill attributable to legacy acquisitions associated with the book club operations in the Children’s Book Publishing and Distribution segment in fiscal 2014.