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Basis of Presentation and Business - Additional information (Detail)	3 Months Ended
	Jun. 30, 2018 Center Facilities
U.S [Member]
Organization And Business Operations [Line Items]
Number of manufacturing facilities	31
Number of sales centers | Center	21
Canada [Member]
Organization And Business Operations [Line Items]
Number of manufacturing facilities	5

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- Definition

Number of manufacturing facilities.

+ References

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- Definition

Number of sales centers.

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- Definition

Organization and business operations.

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- Details

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