Segment Information (Details) - Schedule of segment reporting information (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2014		Aug. 31, 2013		May 31, 2014	May 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 283.8		$ 276.3
Bad debt expense	2.2		1.4
Depreciation & Amortization, including prepublication and production costs	28.0		29.2
Segment operating income (loss)	(53.4)		(45.9)
Segment assets	1,680.4		1,506.0
Goodwill	144.5		157.9		144.5	157.9
Expenditures for long-lived assets including royalty advances	29.3		30.7
Long-lived assets	822.7		685.5
Children's Book Publishing and Distribution
Segment Reporting Information [Line Items]
Revenues	54.7	[1]	54.6	[1]
Bad debt expense	0.5	[1]	0.4	[1]
Depreciation & Amortization, including prepublication and production costs	7.9	[1],[2]	8.0	[1],[2]
Segment operating income (loss)	(60.5)	[1]	(61.5)	[1]
Segment assets	467.2		464.2
Goodwill	40.9		54.3
Expenditures for long-lived assets including royalty advances	15.8	[1]	11.4	[1]
Long-lived assets	146.8		163.6
Educational Technology and Services
Segment Reporting Information [Line Items]
Revenues	89.4		94.8
Bad debt expense	0.3		0.4
Depreciation & Amortization, including prepublication and production costs	7.5	[2]	6.3	[2]
Segment operating income (loss)	30.3		36.2
Segment assets	208.3		207.8
Goodwill	22.7		22.7
Expenditures for long-lived assets including royalty advances	6.0		8.5
Long-lived assets	117.8		118.6
Classroom and Supplemental Materials Publishing
Segment Reporting Information [Line Items]
Revenues	42.8		37.8
Bad debt expense	0		0
Depreciation & Amortization, including prepublication and production costs	2.9	[2]	2.6	[2]
Segment operating income (loss)	(0.5)		(1.6)
Segment assets	161.8		153.6
Goodwill	65.4		65.4
Expenditures for long-lived assets including royalty advances	1.7		2.0
Long-lived assets	90.4		90.5
Media, Licensing and Advertising
Segment Reporting Information [Line Items]
Revenues	10.6	[1]	10.4	[1]
Bad debt expense	0.2	[1]	0	[1]
Depreciation & Amortization, including prepublication and production costs	1.6	[1],[2]	0.6	[1],[2]
Segment operating income (loss)	(3.9)	[1]	(1.9)	[1]
Segment assets	28.7		25.1
Goodwill	5.4		5.4
Expenditures for long-lived assets including royalty advances	1.8	[1]	1.1	[1]
Long-lived assets	14.5		12.2
Overhead
Segment Reporting Information [Line Items]
Revenues	0	[1],[3]	0	[1],[3]
Bad debt expense	0	[1],[3]	0	[1],[3]
Depreciation & Amortization, including prepublication and production costs	5.7	[1],[2],[3]	10.0	[1],[2],[3]
Segment operating income (loss)	(16.9)	[1],[3]	(16.4)	[1],[3]
Segment assets	546.7		407.7
Goodwill	0		0
Expenditures for long-lived assets including royalty advances	0.9	[1],[3]	5.2	[1],[3]
Long-lived assets	386.4		236.2
Total Domestic
Segment Reporting Information [Line Items]
Revenues	197.5		197.6
Bad debt expense	1.0		0.8
Depreciation & Amortization, including prepublication and production costs	25.6		27.5
Segment operating income (loss)	(51.5)		(45.2)
Segment assets	1,412.7		1,258.4
Goodwill	134.4		147.8
Expenditures for long-lived assets including royalty advances	26.2		28.2
Long-lived assets	755.9		621.1
International Segment
Segment Reporting Information [Line Items]
Revenues	86.3		78.7
Bad debt expense	1.2		0.6
Depreciation & Amortization, including prepublication and production costs	2.4	[2]	1.7	[2]
Segment operating income (loss)	(1.9)		(0.7)
Segment assets	267.7		247.6
Goodwill	10.1		10.1
Expenditures for long-lived assets including royalty advances	3.1		2.5
Long-lived assets	$ 66.8		$ 64.4

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjljZjczZTRmMzYyYjQ0YjhiMGEyOTNmYTYwMGQ4OWE0fFRleHRTZWxlY3Rpb246QjkxOEI3NURBNzQyREQyNDAzNEREQTM4NzhBMkM0MkQM}

[2] Includes depreciation of property, plant and equipment and amortization of intangible assets, prepublication and production costs.

[3] Overhead includes all domestic corporate amounts not allocated to segments, including expenses and costs related to the management of corporate assets. Unallocated assets are principally comprised of deferred income taxes and property, plant and equipment related to the Company’s headquarters in the metropolitan New York area, its fulfillment and distribution facilities located in Missouri and its facility located in Connecticut.