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Dispositions - Narrative (Detail) - USD ($) $ in Millions		3 Months Ended
Dispositions - Narrative (Detail) - USD ($) $ in Millions	Jul. 02, 2018	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018
Disposition by Sale \| Business Services \| Print Logistics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash on disposition of business	$ 60.0
Proceeds from sale of business	43.9
Cash included in disposition	$ 4.9
Pre-tax gain resulted from disposition of business			$ 3.6
RRD Brazil
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of business		$ 4.6
Net sales		8.8		$ 16.5
Gain (loss) before income taxes		$ (4.1)		$ (5.0)