Applicable Marginal Interest Rate on Borrowings (Detail)	Jun. 30, 2011
Maximum | Base Rate Borrowings | Term Loan Facility Due March 2013
Line of Credit Facility [Line Items]
Applicable margin rate	1.50%	[1]
Maximum | Base Rate Borrowings | Revolving Credit Facility Due March 31, 2015
Line of Credit Facility [Line Items]
Applicable margin rate	2.25%	[2]
Base Rate Borrowings
Line of Credit Facility [Line Items]
Applicable margin rate	0.75%
Base Rate Borrowings | Term Loan Facility Due March 31, 2016
Line of Credit Facility [Line Items]
Applicable margin rate	2.00%
Base Rate Borrowings | Term Loan Facility Due March 2013 | Minimum
Line of Credit Facility [Line Items]
Applicable margin rate	0.75%	[1]
Base Rate Borrowings | Revolving Credit Facility Due March 31, 2015 | Minimum
Line of Credit Facility [Line Items]
Applicable margin rate	1.25%	[2]
Maximum | LIBOR-Based Borrowings | Term Loan Facility Due March 2013
Line of Credit Facility [Line Items]
Applicable margin rate	2.50%	[1]
Maximum | LIBOR-Based Borrowings | Revolving Credit Facility Due March 31, 2015
Line of Credit Facility [Line Items]
Applicable margin rate	3.25%	[2]
LIBOR-Based Borrowings
Line of Credit Facility [Line Items]
Applicable margin rate	1.75%
LIBOR-Based Borrowings | Term Loan Facility Due March 31, 2016
Line of Credit Facility [Line Items]
Applicable margin rate	3.00%
LIBOR-Based Borrowings | Term Loan Facility Due March 2013 | Minimum
Line of Credit Facility [Line Items]
Applicable margin rate	1.75%	[1]
LIBOR-Based Borrowings | Revolving Credit Facility Due March 31, 2015 | Minimum
Line of Credit Facility [Line Items]
Applicable margin rate	2.25%	[2]

[1] The margin is determined based on our leverage ratio at the date the interest rates are reset on the Term Loans.

[2] The margin is determined based on our credit rating at the date the interest rates are reset on the Revolving Loans