Fair Values by Asset Category of Defined Benefit Pension Plan (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	$ 1,662		$ 1,682	$ 1,716
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	99
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	792	[1]
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	771	[2]
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	1,662
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	99
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	792	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	$ 771	[2]

[1] This category is comprised of publicly traded funds, of which 76% are large-cap funds, 7% are emerging markets equity funds, and 17% are international equity funds.

[2] This category is comprised of publicly traded funds, of which 12% are short-term fixed income funds, 9% are high-yield fixed income funds, 44% are intermediate fixed income funds, 27% are REITs and MLPs funds, and 8% are hedge funds.