Debt - Schedule of Terms and Carrying Value of Debt Instrument (Detail) (USD $) In Millions, unless otherwise specified				0 Months Ended	3 Months Ended		3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended				3 Months Ended
	Aug. 31, 2014	May 31, 2014	Aug. 31, 2014 Asset-based revolving credit facility, 25-Jul-17 [Member] Revolving Credit Facility [Member]	Sep. 25, 2013 Term Loan [Member] LIBOR [Member]	Aug. 31, 2014 Term Loan [Member] Term loan facility, 25-Mar-15 [Member]	May 31, 2014 Term Loan [Member] Term loan facility, 25-Mar-15 [Member]	Aug. 31, 2014 Term Loan [Member] Term loan facility, 25-Mar-15 [Member] LIBOR [Member]	Aug. 31, 2014 Term Loan [Member] Term loan facility, 25-Jul-17 [Member]	May 31, 2014 Term Loan [Member] Term loan facility, 25-Jul-17 [Member]	Aug. 31, 2014 Term Loan [Member] Term loan facility, 25-Jul-17 [Member] LIBOR [Member]	Aug. 31, 2014 Line of Credit [Member] Cash flow revolving credit facility, 25-Apr-17 [Member] Revolving Credit Facility [Member]	May 31, 2014 Line of Credit [Member] Cash flow revolving credit facility, 25-Apr-17 [Member] Revolving Credit Facility [Member]	Aug. 31, 2014 Line of Credit [Member] Cash flow revolving credit facility, 25-Apr-17 [Member] Revolving Credit Facility [Member] LIBOR [Member]	Aug. 31, 2014 Line of Credit [Member] Asset-based revolving credit facility, 25-Jul-17 [Member] Revolving Credit Facility [Member]	May 31, 2014 Line of Credit [Member] Asset-based revolving credit facility, 25-Jul-17 [Member] Revolving Credit Facility [Member]	Aug. 31, 2014 Line of Credit [Member] Asset-based revolving credit facility, 25-Jul-17 [Member] Revolving Credit Facility [Member] LIBOR [Member]	Aug. 31, 2014 Senior notes [Member] 6.500% senior notes due 2020 [Member]	May 31, 2014 Senior notes [Member] 6.500% senior notes due 2020 [Member]	Aug. 31, 2014 Senior Subordinated Notes [Member] 6.500% senior notes due 2020 [Member]	Aug. 31, 2014 Senior Subordinated Notes [Member] 6.500% senior subordinated notes due 2020 [Member]	May 31, 2014 Senior Subordinated Notes [Member] 6.500% senior subordinated notes due 2020 [Member]
Debt Instrument [Line Items]
Maturity period of term loan under the credit facility					Mar. 25, 2015			Jul. 25, 2017			Apr. 25, 2017			Jul. 25, 2017			Aug. 01, 2020			Oct. 01, 2020
Interest rate																	6.50%		6.50%	6.50%
Debt instruments basis spread on variable rate				3.50%			3.00%			3.50%			3.50%			2.00%
Premium on notes	$ 31.1	$ 32.5
Total debt	$ 5,736.3	$ 5,720.4	$ 205.0		$ 103.0	$ 103.3		$ 2,772.2	$ 2,959.6		$ 0	$ 0		$ 205.0	$ 0		$ 1,825.0	$ 1,825.0		$ 800.0	$ 800.0