Contractual Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Mar. 31, 2013
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Data center outsourcing services agreement expiration date	June 30, 2022
Automatic Data Processing, Inc. [Member]
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Data center outsourcing services agreement expiration date	June 30, 2012
IT Services Agreement [Member]
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Commitments under agreement	510.7