Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016
Other Assets, Noncurrent [Abstract]
Recoverable insurance losses	$ 11,188	$ 9,412
Deferred income tax assets	40,178	33,505
Savings plans and supplemental plan	14,194	14,472
Other	18,719	14,297
Total other assets	$ 84,279	$ 71,686