Goodwill and Intangible Assets - Weighted Average Amortization Period by Intangible Asset Class (Detail)	Mar. 31, 2013 Year
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	7.7
Trademarks and patents [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	6.5
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	9.5
Covenant not-to-compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	4.0
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	9.5