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Stock Plans - Activity for Company's Two Stock Incentive Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Number of Options  
Outstanding beginning balance (in shares) | shares 1,904
Options granted (in shares) | shares 0
Options exercised (in shares) | shares (257)
Options forfeited (in shares) | shares 0
Options expired (in shares) | shares (290)
Outstanding ending balance (in shares) | shares 1,357
Exercisable at current period end (in shares) | shares 1,357
Weighted- Average Exercise Price  
Weighted-Average Exercise Price, Outstanding beginning balance (in dollars per share) | $ / shares $ 60.03
Weighted-Average Exercise Price, Options granted (in dollars per share) | $ / shares 0
Weighted-Average Exercise Price, Options exercised (in dollars per share) | $ / shares 41.68
Weighted-Average Exercise Price, Options forfeited (in dollars per share) | $ / shares 0
Weighted-Average Exercise Price, Options expired (in dollars per share) | $ / shares 66.79
Weighted-Average Exercise Price, Outstanding ending balance (in dollars per share) | $ / shares 62.06
Weighted-Average Exercise Price, Exercisable at current period-end (in dollars per share) | $ / shares $ 62.06
Weighted- Average Remaining Contractual Term (Years)  
Weighted-Average Remaining Contractual Term, Outstanding at current period-end 2 years 1 month 13 days
Weighted-Average Remaining Contractual Term, Exercisable at current period-end 2 years 1 month 13 days
Aggregate Intrinsic Value  
Aggregate Intrinsic Value, Outstanding at current period-end | $ $ 13,711
Aggregate Intrinsic Value, Exercisable at current period-end | $ $ 13,711