Fair Values by Asset Category of Defined Benefit Pension Plan (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Jun. 30, 2011	Jun. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	$ 1,682		$ 1,716	$ 1,649
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	104
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	911	[1]
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit pension plan by asset category	667	[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	1,682
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	104
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	911	[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	$ 667	[2]

[1] This category is comprised of publicly traded funds, of which 77% are large-cap funds, 14% are emerging markets equity funds, and 9% are international equity funds.

[2] This category is comprised of publicly traded funds, of which 31% are short-term fixed income funds, 32% are high-yield fixed income funds, 11% are intermediate fixed income funds, 9% are international/emerging markets funds and 17% are REITs and MLPs funds.