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Leases (narrative) (detail) (USD $) | 12 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Operating Leases, Rent Expense, Net [Abstract] |  |  |
Operating Leases, Rent Expense | $ 49,600,000 us-gaap_LeaseAndRentalExpense | $ 43,900,000 us-gaap_LeaseAndRentalExpense | $ 38,100,000 us-gaap_LeaseAndRentalExpense

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_OperatingLeasesRentExpenseAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration