Fair Values of Pension Plan Assets by Asset Class (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 3,307,047	$ 3,238,307
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	46,052	75,015
Equity Securities | US Based Companies
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	292,138	299,321
Equity Securities | Non US Based Companies
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	191,647	203,199
Fixed income securities | Corporate Bond Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	141,549	165,226
Fixed income securities | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	203,000	143,697
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	246,075	5,564
Mutual funds | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	149,807	149,383
Mutual funds | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 151,649	135,949
Common/Collective trusts
Defined Benefit Plan Disclosure [Line Items]
Investments valued using a net asset value per share, redemption frequency	daily
Pension plan assets	$ 1,487,170	1,635,135
Investments valued using a net asset value per share, redemption notice period	30 days
Common/Collective trusts | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 65,404	77,429
Common/Collective trusts | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 43,981	46,184
Limited Partnership
Defined Benefit Plan Disclosure [Line Items]
Investments valued using a net asset value per share, redemption frequency	daily
Pension plan assets	$ 280,248	290,904
Investments valued using a net asset value per share, redemption notice period	30 days
Miscellaneous
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 8,327	11,301
Quoted Prices In Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1,155,720	1,154,489
Quoted Prices In Active Markets (Level 1) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	45,474	75,015
Quoted Prices In Active Markets (Level 1) | Equity Securities | US Based Companies
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	292,138	299,321
Quoted Prices In Active Markets (Level 1) | Equity Securities | Non US Based Companies
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	191,647	203,199
Quoted Prices In Active Markets (Level 1) | Fixed income securities | Corporate Bond Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	73,685	77,224
Quoted Prices In Active Markets (Level 1) | Fixed income securities | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	141,935	90,785
Quoted Prices In Active Markets (Level 1) | Mutual funds | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	149,807	149,383
Quoted Prices In Active Markets (Level 1) | Mutual funds | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	151,649	135,949
Quoted Prices In Active Markets (Level 1) | Common/Collective trusts | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	65,404	77,429
Quoted Prices In Active Markets (Level 1) | Common/Collective trusts | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	43,981	46,184
Quoted Prices In Active Markets (Level 1) | Miscellaneous
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	137,834	152,215
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	578
Significant Other Observable Inputs (Level 2) | Equity Securities | US Based Companies
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets		0
Significant Other Observable Inputs (Level 2) | Equity Securities | Non US Based Companies
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets		0
Significant Other Observable Inputs (Level 2) | Fixed income securities | Corporate Bond Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	67,864	88,002
Significant Other Observable Inputs (Level 2) | Fixed income securities | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	61,065	52,912
Significant Other Observable Inputs (Level 2) | Mutual funds | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Other Observable Inputs (Level 2) | Mutual funds | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Other Observable Inputs (Level 2) | Common/Collective trusts | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Other Observable Inputs (Level 2) | Common/Collective trusts | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Other Observable Inputs (Level 2) | Miscellaneous
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	8,327	11,301
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets		0
Significant Unobservable Inputs (Level 3) | Equity Securities | US Based Companies
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets		0
Significant Unobservable Inputs (Level 3) | Equity Securities | Non US Based Companies
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets		0
Significant Unobservable Inputs (Level 3) | Fixed income securities | Corporate Bond Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Fixed income securities | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Mutual funds | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Mutual funds | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Common/Collective trusts | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Common/Collective trusts | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Miscellaneous
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Company stock included in U.S. based company equity securities	143,652	154,660
Pension plan assets	$ 3,307,047	$ 3,238,307	$ 3,499,274