Accumulated Other Comprehensive Loss - Additional Information (Detail)
|12 Months Ended|
Mar. 31, 2018
|Statement of Comprehensive Income [Abstract]|
|Reclassifications out of Accumulated other comprehensive loss||$ 0|
Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.
Reference 1: http://www.xbrl.org/2003/role/presentationRef