Change in Plan Assets and Obligations (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Benefit obligation at end of year	$ 97,941,000	$ 95,830,000
Fair value of plan assets at end of year	57,146,000	57,174,000
Pension Plans, Defined Benefit
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Actuarial (gain) loss	1,785,000	2,269,000
Employer contributions	3,000,000	0
Fair value of plan assets at end of year	56,465,000	56,352,000
Current liabilities	(1,791,000)	(993,000)
Noncurrent liabilities	(39,087,000)	(37,747,000)
Net amount recognized	(40,878,000)	(38,740,000)
Pension Plans, Defined Benefit | Change in Benefit Obligations
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Benefit obligation at beginning of year	95,830,000	98,490,000
Service cost	1,182,000	1,372,000
Interest cost	3,814,000	3,781,000
Acquisition		(440,000)
Benefits paid	(4,895,000)	(4,726,000)
Actuarial (gain) loss	2,082,000	(2,583,000)
Foreign currency exchange rate changes	(72,000)	(64,000)
Benefit obligation at end of year	97,941,000	95,830,000
Pension Plans, Defined Benefit | Change in Plan Assets
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Benefits paid	(4,895,000)	(4,727,000)
Actuarial (gain) loss	(148,000)	(134,000)
Fair value of plan assets at beginning of year	57,174,000	60,854,000
Actual return	577,000	(6,000)
Expected return	51,000	43,000
Administrative expenses	(27,000)	(36,000)
Acquisition		(225,000)
Employer contributions	4,465,000	1,445,000
Foreign currency exchange rate changes	(51,000)	(40,000)
Fair value of plan assets at end of year	57,146,000	57,174,000
Payroll tax unrecognized in benefit obligation at end of year	83,000	84,000
Unfunded status at end of year	(40,878,000)	(38,740,000)
Other Pension Plans, Defined Benefit
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Actuarial (gain) loss	(1,138,000)	(1,040,000)
Current liabilities	(418,000)	(818,000)
Noncurrent liabilities	(4,393,000)	(4,755,000)
Net amount recognized	(4,811,000)	(5,573,000)
Other Pension Plans, Defined Benefit | Change in Benefit Obligations
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Benefit obligation at beginning of year	5,573,000	23,926,000
Service cost	81,000	212,000
Interest cost	201,000	584,000
Participant contributions	411,000	447,000
Plan amendment		(15,961,000)
Benefits paid	(1,170,000)	(1,043,000)
Actuarial (gain) loss	(285,000)	(2,592,000)
Benefit obligation at end of year	4,811,000	5,573,000
Other Pension Plans, Defined Benefit | Change in Plan Assets
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Participant contributions	411,000	447,000
Benefits paid	(1,170,000)	(1,043,000)
Employer contributions	759,000	596,000
Unfunded status at end of year	$ (4,811,000)	$ (5,573,000)