Stock Option Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended								12 Months Ended						12 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014 Selling, General and Administrative Expenses	Mar. 31, 2013 Selling, General and Administrative Expenses	Mar. 31, 2012 Selling, General and Administrative Expenses	Mar. 31, 2014 Stock Options	Mar. 31, 2014 Performance Shares	Mar. 31, 2014 Minimum Stock Options	Mar. 31, 2014 Maximum Stock Options	Mar. 31, 2014 Maximum Performance Shares	Mar. 31, 2014 2004 Stock Option Plan	Mar. 31, 2014 Omnibus Incentive Plan	Feb. 28, 2012 Omnibus Incentive Plan	Mar. 31, 2014 Omnibus Incentive Plan Stock Options	Mar. 31, 2014 Omnibus Incentive Plan Restricted Stock Units	Mar. 31, 2014 Omnibus Incentive Plan Performance Shares	Mar. 31, 2014 Second anniversary Omnibus Incentive Plan Restricted Stock Units	Mar. 31, 2014 Third Anniversary Omnibus Incentive Plan Restricted Stock Units	Mar. 31, 2014 Prior to fiscal 2012 Stock Options	Mar. 31, 2014 Prior to fiscal 2012 Minimum Stock Options	Mar. 31, 2014 Prior to fiscal 2012 Maximum Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)									2 years	5 years					5 years
Stock options, expiration period (in years)							10 years														5 years	10 years
Options outstanding	913,825	1,203,990										551,181	275,886							176,615
Number of shares authorized under plan														867,570
Common stock, issued	17,039,792	16,849,016											3,857
Shares withheld for tax withholding obligation													2,468
Shares available for future awards													461,497
Unvested shares outstanding	88,910	71,165						60,510			90,770					33,092	60,510
Shares estimated to be issued								0
Award vesting percentage																		50.00%	50.00%
Performance period																	3 years
Option exercise period, post employment																				3 months
Exercisable, Shares	674,565																			86,758
Total intrinsic value of stock options exercised during the period	$ 5.9	$ 21.4	$ 0.6
Weighted average grant date fair value of the employee stock options	$ 15.79	$ 13.93	$ 7.62
Stock-based compensation expense				0.5	1.1	0.8
Related tax benefit for stock-based compensation	0.2	0.4	0.3
Estimated number of shares to be issued													399,748
Unrecognized compensation cost related to unvested share-based compensation	$ 2.0
Unrecognized compensation cost, expected to be recognized over a weighted average period	3 years 1 month 7 days