General and Administrative Expenses - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Component Of Other Operating Income And Expense [Line Items]
Other general and administrative expenses	$ 7,930	$ 7,112	$ 7,464
Sextant Holdings, LLC
Component Of Other Operating Income And Expense [Line Items]
Other general and administrative expenses	1,200	1,300	1,100
Approved Flight time for personal reimbursement included in compensation and benefits	75 hours
Reimbursement amount	$ 400	$ 507