Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended						12 Months Ended				3 Months Ended			12 Months Ended	1 Months Ended
	Jun. 30, 2013	Oct. 31, 2010	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2013 Indemnification Aggregate Deductible	Jun. 30, 2013 Indemnification Aggregate Cap	Jun. 30, 2013 Indemnification Agreement	Jun. 30, 2013 Other Indemnifications	Jun. 30, 2013 Internal Revenue Service (IRS)	Jun. 30, 2013 Internal Revenue Service (IRS) Penalties	Mar. 31, 2012 GATE Holdings, Inc.	Dec. 31, 2011 GATE Holdings, Inc.	Jun. 30, 2013 GATE Holdings, Inc.	Jun. 30, 2010 GATE Holdings, Inc. Massachusetts	Dec. 31, 2009 GATE Holdings, Inc. Massachusetts Period 1	Dec. 31, 2009 GATE Holdings, Inc. Massachusetts Period 2	Apr. 30, 2010 Minimum
Commitments and Contingencies Disclosure [Line Items]
Amount of income tax refunds received		$ 45,100,000				$ 189,300,000
Amount of income tax refunds that IRS requires to audit																			2,000,000
Estimated possible loss							1,000,000	2,000,000			300,000,000	4,100,000
Income tax, state apportionment																100.00%
Additional assessments of tax, along with accrued interest																	11,900,000	8,100,000
Income tax benefit														12,500,000
Net income tax and interest payment													5,100,000
Accrual Income tax payable	25,922,000		25,922,000	23,414,000											25,200,000
Additional state tax liability recognized for the 2008 and 2009 tax years	822,000		822,000
Claim period									18 months
Additional estimated loss										750,000
Additional cost buyer could recover in aggregate									2,000,000
Operating lease expiry date			2017-11
Operating leases rent expense			4,400,000	3,300,000	5,600,000
Non-cancelable subleases receivables	$ 3,500,000		$ 3,500,000