Pension and Post-Retirement Benefit Plans (Tables)

6 Months Ended

Feb. 28, 2013

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

The components of the net periodic pension and post-retirement benefit costs are as follows:

Defined benefit pension plans	Three months ended						Six months ended
	February 28, 2013			February 29, 2012			February 28, 2013			February 29, 2012
	(In thousands)
Service cost	$	486		$	380		$	972		$	760
Interest cost		662			682			1,324			1,364
Expected return on plan assets		(717	)		(729	)		(1,434	)		(1,458	)
Amortization of prior service cost		60			57			120			114
Amortization of actuarial losses		483			193			966			386
Net periodic benefit cost	$	974		$	583		$	1,948		$	1,166

Post-retirement health care plans	Three months ended						Six months ended
	February 28, 2013			February 29, 2012			February 28, 2013			February 29, 2012
	(In thousands)
Service cost	$	59		$	57		$	118		$	114
Interest cost		215			243			430			486
Amortization of prior service cost		(38	)		(38	)		(76	)		(76	)
Amortization of actuarial losses		67			—			134			—
Net periodic benefit cost	$	303		$	262		$	606		$	524