Retirement Plans (Tables)

6 Months Ended

Nov. 30, 2011

Retirement Plans [Abstract]

Schedule Of Defined Benefit Pension Plan And Postretirement Health Benefit Plan Expense

		Three months ended November 30,								Six months ended November 30,
In thousands		2011				2010				2011				2010
Defined benefit pension plan
Service cost	$		134		$		126		$		268		$		251
Interest cost			760				737				1,520				1,475
Expected return on plan assets			(777	)			(685	)			(1,554	)			(1,370	)
Amortization of net actuarial loss			430				517				861				1,034
	$		547		$		695		$		1,095		$		1,390
Postretirement health benefit plan
Service cost	$		25		$		29		$		50		$		57
Interest cost			104				106				208				212
Amortization of prior service cost			(194	)			(193	)			(388	)			(387	)
Amortization of net actuarial loss			141				153				282				307
	$		76		$		95		$		152		$		189

Schedule Of Financial Security Plan Benefit Expense Charged To Costs And Expenses

		Three months ended November 30,						Six months ended November 30,
In thousands		2011			2010			2011			2010
Service cost	$		537	$		550	$		1,074	$		1,100
Interest cost			629			578			1,258			1,156
	$		1,166	$		1,128	$		2,332	$		2,256