Acquisition of Parlophone Label Group - Additional Information (Detail) (Parlophone Label Group) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended		12 Months Ended
	Feb. 06, 2013 GBP (£)	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Jun. 30, 2013 GBP (£)	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)
Business Acquisition [Line Items]
Percentage of ownership on acquisition	100.00%
Business acquisition, cash paid	£ 487			£ 487
Business acquisition, date of agreement					Feb. 06, 2013
Professional fees and integration costs related to Acquisition		16			36		38
Additional Transaction fee under Management Agreement in relation to Acquisition							11
Pro forma revenue since acquisition date		72			146
Acquired entity pro forma revenue			52			189
Actual operating income loss of acquired entity		35			58
Acquired entity pro forma operating income (loss)			14			11
Restructuring costs		$ 17			$ 24