Change in Plan Assets and Obligations (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
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	$ 95,830,000	$ 96,308,000
Fair value of plan assets at end of year	57,174,000	59,485,000
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	2,269,000	988,000
Employer contributions	0	0
Fair value of plan assets at end of year	56,352,000	58,619,000
Current liabilities	(993,000)	(1,306,000)
Noncurrent liabilities	(37,747,000)	(35,517,000)
Net amount recognized	(38,740,000)	(36,823,000)
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	98,490,000	84,067,000
Service cost	1,372,000	825,000
Interest cost	3,781,000	3,873,000
Acquisition	(440,000)
Benefits paid	(4,726,000)	(4,405,000)
Actuarial (gain) loss	(2,583,000)	11,948,000
Foreign currency exchange rate changes	(64,000)
Benefit obligation at end of year	95,830,000	96,308,000
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	(4,727,000)	(4,405,000)
Actuarial (gain) loss	(134,000)
Benefit obligation at end of year	84,000
Fair value of plan assets at beginning of year	60,854,000	56,896,000
Actual return	(6,000)	6,069,000
Expected return	43,000
Administrative expenses	(36,000)
Acquisition	(225,000)
Employer contributions	1,445,000	925,000
Foreign currency exchange rate changes	(40,000)
Fair value of plan assets at end of year	57,174,000	59,485,000
Unfunded status at end of year	(38,740,000)	(36,823,000)
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	(1,040,000)	(1,299,000)
Current liabilities	(818,000)	(908,000)
Noncurrent liabilities	(4,755,000)	(23,018,000)
Net amount recognized	(5,573,000)	(23,926,000)
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	23,926,000	24,114,000
Service cost	212,000	273,000
Interest cost	584,000	904,000
Participant contributions	447,000	430,000
Plan amendment	(15,961,000)
Benefits paid	(1,043,000)	(863,000)
Actuarial (gain) loss	(2,592,000)	(932,000)
Benefit obligation at end of year	5,573,000	23,926,000
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	447,000	430,000
Benefits paid	(1,043,000)	(863,000)
Employer contributions	596,000	433,000
Unfunded status at end of year	$ (5,573,000)	$ (23,926,000)