Debt - 2012 Debt Refinancing - Additional Information (Detail) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended					6 Months Ended		6 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended			1 Months Ended		12 Months Ended			1 Months Ended			1 Months Ended		1 Months Ended	12 Months Ended
	May 09, 2013 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2014 6.25% Senior Secured Notes EUR (€)	Sep. 30, 2013 6.25% Senior Secured Notes EUR (€)	Mar. 31, 2013 6.25% Senior Secured Notes	Mar. 31, 2014 Term Loan Facility due 2020 USD ($)	Sep. 30, 2013 Term Loan Facility due 2020 USD ($)	Mar. 31, 2014 6.00% Senior Secured Notes	Mar. 31, 2013 6.00% Senior Secured Notes	Mar. 31, 2014 Term Loan Facility	Mar. 31, 2014 Term Loan Facility London Interbank Offered Rate (LIBOR)	Mar. 31, 2014 Term Loan Facility Base Rate	Dec. 31, 2012 Revolving Credit Facility USD ($)	Mar. 31, 2014 Revolving Credit Facility	Mar. 31, 2014 Revolving Credit Facility London Interbank Offered Rate (LIBOR)	Mar. 31, 2014 Revolving Credit Facility Base Rate	Jun. 30, 2013 Incremental Term Loan Facility USD ($)	Nov. 01, 2012 2012 Debt Refinancing	Sep. 30, 2013 2012 Debt Refinancing USD ($)	Mar. 31, 2014 2012 Debt Refinancing USD ($)	Dec. 31, 2012 2012 Debt Refinancing USD ($)	Nov. 01, 2012 2012 Debt Refinancing Refinancing Transaction USD ($)	Nov. 01, 2012 2012 Debt Refinancing 6.00% Senior Secured Notes due 2021 USD ($)	Nov. 01, 2012 2012 Debt Refinancing 6.25% Senior Secured Notes EUR (€)	Nov. 01, 2012 2012 Debt Refinancing 9.5% Senior Secured Notes due 2016 USD ($)	Nov. 01, 2012 2012 Debt Refinancing Term Loan Facility USD ($)	Nov. 01, 2012 2012 Debt Refinancing Revolving Credit Facility USD ($)	Sep. 30, 2013 Debt Redemption USD ($)	Sep. 30, 2013 Debt Redemption 6.25% Senior Secured Notes EUR (€)	Sep. 30, 2013 Debt Redemption Senior Secured Notes due 2021	Sep. 30, 2013 Debt Redemption 6.00% Senior Secured Notes USD ($)
Debt Instrument [Line Items]
Face or Principal amount of Debt Instrument						€ 158	€ 158		$ 1,307	$ 1,310										$ 820			$ 1,250			$ 500	€ 175		$ 600
Due date of Senior Secured Notes						2021			2020		2021										2021							2016
Issuance of Term Loan and Credit Facility																														150
Available cash																								101
Senior Secured Notes Extinguished																												1,250
Interest rate						6.25%		6.25%			6.00%	6.00%																9.50%
Retired Revolving Credit Facility																														60
Repayment of New Revolving Credit Facility				230	31											31
Redemption payment																									1,377
Repayments of long term debt outstanding																									1,250
Tender/Call premium on redemption of debt																									93
Secured Notes consent fees																									34
Accrued interest paid		33	10	101	110																				45
Loss on extinguishment of debt					(83)																	(83)									(2)
Debt unamortized premium of Old Secured Notes																							55
Unamortized debt issuance costs related to Old Secured Notes																							11
Prepaid term loans	102.5
Incremental draw down of Term Loan Facility																				820
Percentage of senior secured notes redeemed																																	10.00%
Repayment of Acquisition Corp Senior Secured Notes																																€ 17.5		$ 50.0
Debt instrument, marginal interest rate														2.75%	1.75%			2.00%	1.00%
Interest rate applicable to overdue principal				2.00%													2.00%
Description of variable rate basis													The loans under the Senior Term Loan Facility bear interest at Term Loan Borrower’s election at a rate equal to (i) the rate for deposits in U.S. dollars in the London interbank market (adjusted for maximum reserves) for the applicable interest period (“Term Loan LIBOR”), plus 2.75% per annum, or (ii) the base rate, which is the highest of (x) the corporate base rate established by the administrative agent as its prime rate in effect at its principal office in New York City from time to time, (y) 0.50% in excess of the overnight federal funds rate and (z) one-month Term Loan LIBOR, plus 1.00% per annum, plus, in each case, 1.75% per annum.				The loans under the Revolving Credit Facility bear interest at Revolving Borrower’s election at a rate equal to (i) the rate for deposits in the borrowing currency in the London interbank market (adjusted for maximum reserves) for the applicable interest period (“Revolving LIBOR”), plus 2.00% per annum, or (ii) the base rate, which is the highest of (x) the corporate base rate established by the administrative agent from time to time, (y) 0.50% in excess of the overnight federal funds rate and (z) the one-month Revolving LIBOR plus 1.0% per annum, plus, in each case, 1.00% per annum. If there is a payment default at any time, then the interest rate applicable to overdue principal will be the rate otherwise applicable to such loan plus 2.0% per annum.
Annual Amortization of original principal on term loan		1.00%		1.00%
Credit Facility maturity date													Jul. 01, 2020				Nov. 01, 2017