PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

3 Months Ended

Jun. 30, 2015

Pension Plan [Member]

Components of net periodic benefit costs:

Schedule of components of net periodic benefit cost and postretirement benefit plan

	Pension benefits
		Three Months Ended June 30,
		2015			2014
Components of net periodic benefit expense (income):
Service cost		$	2,767		$	3,256
Interest cost		22,677			21,951
Expected return on plan assets		(40,853		)	(36,913		)
Amortization of prior service credits		(1,146		)	(1,321		)
Amortization of net loss		2,522			—
Curtailments		2,863			—
Net periodic benefit income		$	(11,170	)	$	(13,027	)

Other postretirement

Components of net periodic benefit costs:

Schedule of components of net periodic benefit cost and postretirement benefit plan

	Other postretirement benefits
		Three Months Ended June 30,
		2015			2014
Components of net periodic benefit (income) expense:
Service cost		$	326		$	717
Interest cost		2,070			3,082
Amortization of prior service credits		(1,345		)	(1,132		)
Amortization of net loss		(1,643		)	—
Net periodic benefit (income) expense		$	(592	)	$	2,667