Acquisitions and Dispositions - Narrative (Detail) - USD ($) shares in Millions, $ in Millions				3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Jun. 08, 2015	Mar. 25, 2014	Jan. 31, 2014	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Apr. 29, 2015	Aug. 15, 2014	Mar. 10, 2014	Feb. 07, 2014
Business Acquisition [Line Items]
Business acquisition, loss before income taxes				$ 22.5		$ 70.5			$ 118.0	$ 107.0
Restructuring, impairment and other charges				52.9		19.9			104.9	87.9
Inventory purchase accounting, adjustment reversal				6.7		(0.1)			9.9	3.5
Acquisition-related expenses				0.3					14.1	8.2
Gain on bargain purchase										9.5
International
Business Acquisition [Line Items]
Restructuring, impairment and other charges				$ 39.3		1.9			49.8	7.5
International | RRDA
Business Acquisition [Line Items]
Net sales										22.1
Gain (loss) before income taxes										(3.4)
Bankruptcy liquidation on effective of court approval											$ 16.4
International | GRES
Business Acquisition [Line Items]
Gain (loss) on disposition of business											(0.8)
Net proceeds of disposition of business															$ 1.8
International | 2015 Dispositions
Business Acquisition [Line Items]
Gain (loss) on disposition of business									(14.7)
Net sales									16.3	81.7
Gain (loss) before income taxes									$ (38.4)	0.4
International | Venezuelan Operating Entity | 2015 Dispositions
Business Acquisition [Line Items]
Joint venture, ownership percentage				50.10%					50.10%			50.10%
Variable Print
Business Acquisition [Line Items]
Restructuring, impairment and other charges				$ 2.9		8.3			$ 11.9	35.1
Strategic Services
Business Acquisition [Line Items]
Restructuring, impairment and other charges				3.5		$ 1.2			11.5	$ 9.0
Strategic Services | Journalism Online
Business Acquisition [Line Items]
Gain (loss) on disposition of business											11.2
Net proceeds of disposition of business													$ 10.5
Proceeds from Divestiture of Businesses								$ 10.5
Loss recognized as a result of final sale price adjustment									0.2
Gain (loss) on disposition of business after adjustments									11.0
Courier Corporation
Business Acquisition [Line Items]
Purchase price of acquisition, cash	$ 137.3
Issuance of common stock shares for acquisitions of businesses	8.0				8.0
Transaction value of acquisition	$ 291.5
Debt assumed	78.2			78.9					78.9
Cash acquired from acquisition	$ 20.9
Business acquisition, net sales									109.0
Business acquisition, loss before income taxes									(23.9)
Restructuring, impairment and other charges									29.3
Inventory purchase accounting, adjustment reversal									9.9
Tax deductible goodwill				9.3					9.3
Esselte Corporation | Variable Print
Business Acquisition [Line Items]
Purchase price of acquisition, cash		$ 82.3
Issuance of common stock shares for acquisitions of businesses		1.0
Transaction value of acquisition		$ 100.6
Cash acquired from acquisition		6.4
Fair value of the identifiable net assets acquired		$ 110.1
Gain on bargain purchase											$ 9.5
MultiCorpora R&D Inc. and MultiCorpora International Inc | Strategic Services
Business Acquisition [Line Items]
Fair value of the identifiable net assets acquired														$ 6.0
Consolidated Graphics, Inc
Business Acquisition [Line Items]
Issuance of common stock shares for acquisitions of businesses							16.0
Cash acquired from acquisition			$ 62.0
Consolidated Graphics, Inc | Variable Print and International segments
Business Acquisition [Line Items]
Purchase price of acquisition, cash			$ 359.9
Issuance of common stock shares for acquisitions of businesses			16.0
Debt assumed			$ 118.4
Fair value of the identifiable net assets acquired			$ 660.6
Esselte Multi Corpora And Consolidated Graphics Acquisition
Business Acquisition [Line Items]
Tax deductible goodwill				$ 73.4					$ 73.4