Contractual Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Dec. 31, 2012
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Expiration date on agreement	June 30, 2022
Automatic Data Processing Inc [Member]
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Expiration date on agreement	June 30, 2012
IT Services Agreement [Member]
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Commitments under agreement	525.3