Description of Business - Additional Information (Detail)	3 Months Ended
	Dec. 31, 2016 Operations Country songwriters
Description Of Business [Line Items]
Number of fundamental operations | Operations	2
Number of countries in which Recorded Music activity conducted | Country	50
Number of songwriters and composers | songwriters	70,000
Parlophone Label Group
Description Of Business [Line Items]
Acquisition date	Jul. 01, 2013