Borrowings - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended				6 Months Ended				1 Months Ended	3 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended			6 Months Ended
	Dec. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Aug. 31, 2013 3.95% Senior Notes [Member]	May 31, 2007 6.125% Senior Notes [Member]	Dec. 31, 2013 Fiscal 2014 Senior Notes [Member]	Dec. 31, 2013 Fiscal 2007 Senior Notes [Member]	Jun. 30, 2013 Fiscal 2007 Senior Notes [Member]	Jun. 30, 2009 Fiscal 2007 Senior Notes [Member]	Sep. 30, 2013 Fiscal 2012 Term Loan Facility [Member]	Sep. 30, 2013 Fiscal 2012 Term Loan Facility [Member]	Dec. 31, 2012 Fiscal 2012 Term Loan Facility [Member]	Sep. 30, 2012 Fiscal 2012 Term Loan Facility [Member]	Dec. 31, 2013 Five-Year Term Loan Facility [Member]	Sep. 22, 2011 Five-Year Term Loan Facility [Member]	Dec. 31, 2013 Five-Year Revolving Credit Facility [Member]	Dec. 31, 2012 Five-Year Revolving Credit Facility [Member]	Dec. 31, 2013 Five-Year Revolving Credit Facility [Member]	Dec. 31, 2012 Five-Year Revolving Credit Facility [Member]	Sep. 22, 2011 Five-Year Revolving Credit Facility [Member]	Dec. 31, 2013 Fiscal 2012 Revolving Credit Facility [Member]	Jun. 30, 2013 Fiscal 2012 Revolving Credit Facility [Member]	Sep. 22, 2011 Fiscal 2012 Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		$ 490.0													$ 490.0					$ 500.0			$ 990.0
Interest at LIBOR plus basis points														1.25%				1.25%
Annual facility fee (as basis points)																		0.15%
Annual facility fee, Total																0.2	0.2	0.4	0.4
Debt issuance costs																					3.0
Debt issuance cost expensed																					0.1
Debt issuance cost capitalized										0.9	0.9					0.8		0.8			2.9
Accumulated Amortization of debt issuance costs																					2.1	1.0
Repayment of borrowings		90.0								400.0	400.0
Weighted-average interest rate										1.44%	1.44%	1.48%	1.49%
Senior notes offered				400.0	250.0
Interest rate						3.95%	6.125%
Maturity date						Sep. 01, 2020	Jun. 01, 2017
Frequency of interest payment, description						Interest on the Fiscal 2014 Senior Notes is payable semi-annually in arrears on March 1 and September 1 of each year.	Interest on the Fiscal 2007 Senior Notes is payable semi-annually in arrears on June 1 and December 1 of each year.
Percentage of Notes issued	99.10%					99.871%
Effective yield to maturity	6.251%					3.971%
Payments of debt issuance costs	4.3					4.3	1.9
Amortization related to the Senior Notes						0.3	1.2	1.1
Debt issuance cost, amortization period						7 years	10 years
Purchased principal amount of Senior Notes									125.0
Unamortized bond discount									1.0
Senior Notes, fair value						403.5	136.9	138.2
Outstanding amount of line of credit	$ 0		$ 0